Honestly, any modern synthetic oil is going to be wildly superior to anything available in 1966 and will be just fine.
If you're worried, run Rotella, it's cheap and it works.
If you're worried, run Rotella, it's cheap and it works.
Oil Recommendation for '66 Cadillac 7.0L
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Jackson_Slugger
$50 Site Donor 2022
Originally Posted by tundraotto
Originally Posted by Jackson_Slugger
Originally Posted by tundraotto
The owners manual recommends straight 30W oil for the vehicle at above 40F degree temperatures.
Em, if we're talking about a 429 cu. inch 7.0L, the manual recommends nothing heavier than 10W-30 or "SAE20" above freezing (32F, 0C). Below 0F, they recommended 5W-20 (or 5W)...
The interval was 60 days, but not to exceed 6,000 miles...
I would use Rotella T5 10W-30 or Mobil 1 HM in the same weight...
In 1966 the 429/7L V8 - the The owners manual recommends straight "30W oil for the vehicle at above 40F degree temperatures."
I wouldn't be surprised if a 1966 429 V8 went through 10W-30 oil like a sieve, but that's just guess.
And your source is? The Cadillac manual stated that 10W-30 was used from 0F to above. It made no mention of SAE 30, and said you could also use SAE 20 above 32F. Feel free to post your source, mine is page 42...
I'd be more worried about that eras lack of hydrocracked 5W-20's below freezing...
Originally Posted by Jackson_Slugger
Originally Posted by tundraotto
The owners manual recommends straight 30W oil for the vehicle at above 40F degree temperatures.
Em, if we're talking about a 429 cu. inch 7.0L, the manual recommends nothing heavier than 10W-30 or "SAE20" above freezing (32F, 0C). Below 0F, they recommended 5W-20 (or 5W)...
The interval was 60 days, but not to exceed 6,000 miles...
I would use Rotella T5 10W-30 or Mobil 1 HM in the same weight...
In 1966 the 429/7L V8 - the The owners manual recommends straight "30W oil for the vehicle at above 40F degree temperatures."
I wouldn't be surprised if a 1966 429 V8 went through 10W-30 oil like a sieve, but that's just guess.
And your source is? The Cadillac manual stated that 10W-30 was used from 0F to above. It made no mention of SAE 30, and said you could also use SAE 20 above 32F. Feel free to post your source, mine is page 42...
I'd be more worried about that eras lack of hydrocracked 5W-20's below freezing...
Originally Posted by Jackson_Slugger
Originally Posted by tundraotto
Originally Posted by Jackson_Slugger
Originally Posted by tundraotto
The owners manual recommends straight 30W oil for the vehicle at above 40F degree temperatures.
Em, if we're talking about a 429 cu. inch 7.0L, the manual recommends nothing heavier than 10W-30 or "SAE20" above freezing (32F, 0C). Below 0F, they recommended 5W-20 (or 5W)...
The interval was 60 days, but not to exceed 6,000 miles...
I would use Rotella T5 10W-30 or Mobil 1 HM in the same weight...
In 1966 the 429/7L V8 - the The owners manual recommends straight "30W oil for the vehicle at above 40F degree temperatures."
I wouldn't be surprised if a 1966 429 V8 went through 10W-30 oil like a sieve, but that's just guess.
And your source is? The Cadillac manual stated that 10W-30 was used from 0F to above. It made no mention of SAE 30, and said you could also use SAE 20 above 32F. Feel free to post your source, mine is page 42...
I'd be more worried about that eras lack of hydrocracked 5W-20's below freezing...
What year is that 'manual'? This is a 1966. Not too many 5W-20 made back then. I'll find the page....
Originally Posted by tundraotto
Originally Posted by Jackson_Slugger
Originally Posted by tundraotto
The owners manual recommends straight 30W oil for the vehicle at above 40F degree temperatures.
Em, if we're talking about a 429 cu. inch 7.0L, the manual recommends nothing heavier than 10W-30 or "SAE20" above freezing (32F, 0C). Below 0F, they recommended 5W-20 (or 5W)...
The interval was 60 days, but not to exceed 6,000 miles...
I would use Rotella T5 10W-30 or Mobil 1 HM in the same weight...
In 1966 the 429/7L V8 - the The owners manual recommends straight "30W oil for the vehicle at above 40F degree temperatures."
I wouldn't be surprised if a 1966 429 V8 went through 10W-30 oil like a sieve, but that's just guess.
And your source is? The Cadillac manual stated that 10W-30 was used from 0F to above. It made no mention of SAE 30, and said you could also use SAE 20 above 32F. Feel free to post your source, mine is page 42...
I'd be more worried about that eras lack of hydrocracked 5W-20's below freezing...
What year is that 'manual'? This is a 1966. Not too many 5W-20 made back then. I'll find the page....
Jackson_Slugger
$50 Site Donor 2022
See page 42: https://www.uscars.biz/uscars/cadillac-documents/owners_manual_cadillac_1966.pdf
5W-20 was in fact a weight of oil offered (and not a good one in that day and age). How common and easily obtainable? I don't know. But the first incarnation of Mobil 1 was a 5W-20 circa 1974...
But I have a Quaker State "Lubrication Guide" circa 1996 covering old oil recommendations referring to 5W-20 pre-dating the Honda and Ford recommendations of the SJ version in the late 1990's...
5W-20 was in fact a weight of oil offered (and not a good one in that day and age). How common and easily obtainable? I don't know. But the first incarnation of Mobil 1 was a 5W-20 circa 1974...
But I have a Quaker State "Lubrication Guide" circa 1996 covering old oil recommendations referring to 5W-20 pre-dating the Honda and Ford recommendations of the SJ version in the late 1990's...
Originally Posted by Jackson_Slugger
See page 42: https://www.uscars.biz/uscars/cadillac-documents/owners_manual_cadillac_1966.pdf
5W-20 was in fact a weight of oil offered, how common and easily obtainable I don't know. But the first incarnation of Mobil 1 was a 5W-20 circa 1974...
Maybe it was - but this is a 1966 model
See page 42: https://www.uscars.biz/uscars/cadillac-documents/owners_manual_cadillac_1966.pdf
5W-20 was in fact a weight of oil offered, how common and easily obtainable I don't know. But the first incarnation of Mobil 1 was a 5W-20 circa 1974...
Maybe it was - but this is a 1966 model
Jackson_Slugger
$50 Site Donor 2022
Originally Posted by tundraotto
Originally Posted by Jackson_Slugger
See page 42: https://www.uscars.biz/uscars/cadillac-documents/owners_manual_cadillac_1966.pdf
5W-20 was in fact a weight of oil offered, how common and easily obtainable I don't know. But the first incarnation of Mobil 1 was a 5W-20 circa 1974...
Maybe it was - but this is a 1966 model
As is the link to the manual I posted...
Originally Posted by Jackson_Slugger
See page 42: https://www.uscars.biz/uscars/cadillac-documents/owners_manual_cadillac_1966.pdf
5W-20 was in fact a weight of oil offered, how common and easily obtainable I don't know. But the first incarnation of Mobil 1 was a 5W-20 circa 1974...
Maybe it was - but this is a 1966 model
As is the link to the manual I posted...
All this talk about SAE30
Here:
https://www.napaonline.com/en/p/CVJ...hsfDK5QIVyiCtBh23Uwm3EAQYByABEgIbd_D_BwE
Edit: heres your filter https://www.napaonline.com/en/p/PSW21258
Here:
https://www.napaonline.com/en/p/CVJ...hsfDK5QIVyiCtBh23Uwm3EAQYByABEgIbd_D_BwE
Edit: heres your filter https://www.napaonline.com/en/p/PSW21258
Last edited:
Originally Posted by Jackson_Slugger
See page 42: https://www.uscars.biz/uscars/cadillac-documents/owners_manual_cadillac_1966.pdf
5W-20 was in fact a weight of oil offered (and not a good one in that day and age). How common and easily obtainable? I don't know. But the first incarnation of Mobil 1 was a 5W-20 circa 1974...
But I have a Quaker State "Lubrication Guide" circa 1996 covering old oil recommendations referring to 5W-20 pre-dating the Honda and Ford recommendations of the SJ version in the late 1990's...
And as Shannow has pointed out here many times the 5W-20 of that time is not the same HTHS as today's 5W-20.
See page 42: https://www.uscars.biz/uscars/cadillac-documents/owners_manual_cadillac_1966.pdf
5W-20 was in fact a weight of oil offered (and not a good one in that day and age). How common and easily obtainable? I don't know. But the first incarnation of Mobil 1 was a 5W-20 circa 1974...
But I have a Quaker State "Lubrication Guide" circa 1996 covering old oil recommendations referring to 5W-20 pre-dating the Honda and Ford recommendations of the SJ version in the late 1990's...
And as Shannow has pointed out here many times the 5W-20 of that time is not the same HTHS as today's 5W-20.
Originally Posted by kschachn
And as Shannow has pointed out here many times the 5W-20 of that time is not the same HTHS as today's 5W-20.
So true and as my old can of Mobil1 5w-20 says "Outperforms 10w-40 premium motor oil".
And as Shannow has pointed out here many times the 5W-20 of that time is not the same HTHS as today's 5W-20.
So true and as my old can of Mobil1 5w-20 says "Outperforms 10w-40 premium motor oil".
Jackson_Slugger
$50 Site Donor 2022
Originally Posted by kschachn
Originally Posted by Jackson_Slugger
See page 42: https://www.uscars.biz/uscars/cadillac-documents/owners_manual_cadillac_1966.pdf
5W-20 was in fact a weight of oil offered (and not a good one in that day and age). How common and easily obtainable? I don't know. But the first incarnation of Mobil 1 was a 5W-20 circa 1974...
But I have a Quaker State "Lubrication Guide" circa 1996 covering old oil recommendations referring to 5W-20 pre-dating the Honda and Ford recommendations of the SJ version in the late 1990's...
And as Shannow has pointed out here many times the 5W-20 of that time is not the same HTHS as today's 5W-20.
Okay. The year of the car was 1966, so we're talking conventional here. Though I think maybe it was Total that came out with a syn-blend in the 60's. It was Motul actually after checking...
Originally Posted by Jackson_Slugger
See page 42: https://www.uscars.biz/uscars/cadillac-documents/owners_manual_cadillac_1966.pdf
5W-20 was in fact a weight of oil offered (and not a good one in that day and age). How common and easily obtainable? I don't know. But the first incarnation of Mobil 1 was a 5W-20 circa 1974...
But I have a Quaker State "Lubrication Guide" circa 1996 covering old oil recommendations referring to 5W-20 pre-dating the Honda and Ford recommendations of the SJ version in the late 1990's...
And as Shannow has pointed out here many times the 5W-20 of that time is not the same HTHS as today's 5W-20.
Okay. The year of the car was 1966, so we're talking conventional here. Though I think maybe it was Total that came out with a syn-blend in the 60's. It was Motul actually after checking...
Last edited:
Originally Posted by tundraotto
."
I wouldn't be surprised if a 1966 429 V8 went through 10W-30 oil like a sieve, but that's just guess.
Ridiculous... 10w30 is perfect and all I ever used in 60s v8s through the 1970s and 80s. Now I tend towards 5w30 or 5w40, but the idea that old American engines burn oil (unless they're in terrible shape) is a myth.
."
I wouldn't be surprised if a 1966 429 V8 went through 10W-30 oil like a sieve, but that's just guess.
Ridiculous... 10w30 is perfect and all I ever used in 60s v8s through the 1970s and 80s. Now I tend towards 5w30 or 5w40, but the idea that old American engines burn oil (unless they're in terrible shape) is a myth.
Originally Posted by 440Magnum
Originally Posted by tundraotto
."
I wouldn't be surprised if a 1966 429 V8 went through 10W-30 oil like a sieve, but that's just guess.
Ridiculous... 10w30 is perfect and all I ever used in 60s v8s through the 1970s and 80s. Now I tend towards 5w30 or 5w40, but the idea that old American engines burn oil (unless they're in terrible shape) is a myth.
I agree. My daily driver in the summer is a 76 350 Olds v8 from the junkyard. Probably 300k miles at least (I put 100k on it the past 10 years). It uses a at between oil changes, doesn't seem to matter if it's 5w30 or 15w50.
My winter daily is an 83 Chevy 305 that only used about a qt every 2k miles despite leaking from the valve covers, valve seals and oil pan at least. I use 0w30 or 0w40 usually in the winter.
I was using thicker oil in the Olds because oil pressure is slightly low and has been for 100k miles, but I discovered it's valve train is much quieter with a 30weight so I switched to Mobil 1 ep 10w30.
Originally Posted by tundraotto
."
I wouldn't be surprised if a 1966 429 V8 went through 10W-30 oil like a sieve, but that's just guess.
Ridiculous... 10w30 is perfect and all I ever used in 60s v8s through the 1970s and 80s. Now I tend towards 5w30 or 5w40, but the idea that old American engines burn oil (unless they're in terrible shape) is a myth.
I agree. My daily driver in the summer is a 76 350 Olds v8 from the junkyard. Probably 300k miles at least (I put 100k on it the past 10 years). It uses a at between oil changes, doesn't seem to matter if it's 5w30 or 15w50.
My winter daily is an 83 Chevy 305 that only used about a qt every 2k miles despite leaking from the valve covers, valve seals and oil pan at least. I use 0w30 or 0w40 usually in the winter.
I was using thicker oil in the Olds because oil pressure is slightly low and has been for 100k miles, but I discovered it's valve train is much quieter with a 30weight so I switched to Mobil 1 ep 10w30.
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I wonder how this would fare for the classic crowd
https://www.amazon.com/gp/product/B...;linkId=c965541b54413f325e33e0c30084635e
https://www.amazon.com/gp/product/B...;linkId=c965541b54413f325e33e0c30084635e
Originally Posted by 440Magnum
Originally Posted by tundraotto
."
I wouldn't be surprised if a 1966 429 V8 went through 10W-30 oil like a sieve, but that's just guess.
Ridiculous... 10w30 is perfect and all I ever used in 60s v8s through the 1970s and 80s. Now I tend towards 5w30 or 5w40, but the idea that old American engines burn oil (unless they're in terrible shape) is a myth.
It would not surprise me a bit if 20W20 was a recommendation year round grade.
Originally Posted by tundraotto
."
I wouldn't be surprised if a 1966 429 V8 went through 10W-30 oil like a sieve, but that's just guess.
Ridiculous... 10w30 is perfect and all I ever used in 60s v8s through the 1970s and 80s. Now I tend towards 5w30 or 5w40, but the idea that old American engines burn oil (unless they're in terrible shape) is a myth.
It would not surprise me a bit if 20W20 was a recommendation year round grade.
20w-20 was my Dad's go to lubricant for our '65 Cutlass (330 4bbl), '65 Dynamic 88 (425 2bbl) and '68 Delmont 88 (350 2bbl). By the time he moved on to a '70 442 (455 4bbl) and '71 Cutlass (350 4bbl) he was all in on 10w-30. Point being, nothing heavier than 10w-30 was used in any of these engines and none were prodigious oil drinkers.
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