I was looking at an owners manual for a 1970 Cadillac and noticed the oil recommendation. I was surprised to see 5W and 5W-20, which I didn't know existed at that time!
I learned something new (historic info)!
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I remember when I first heard the Ford F-150's required a 5-20. I couldn't hardly believe they would run on such thin oil. Thanks for posting.
Statement about filter every other change should blow some minds too...
I guess from that chart, if you own a 1970 Cadillac in Phoenix in the Summer, you're either walking or taking the bus.
Originally Posted By: DuckRyder
Statement about filter every other change should blow some minds too...
What was the recommended OCI, 1000 miles?
;^)
Statement about filter every other change should blow some minds too...
What was the recommended OCI, 1000 miles?
;^)
They did exist but as you see they only wanted you to use it in 20F or lower temps.
My dad used Mobil 1 back in 1976 in Northern Finland where it got to -30C in winter, that was the original 5W-20, in Summer he used 10W-40 or 20W-50 as per the O.M.
My dad used Mobil 1 back in 1976 in Northern Finland where it got to -30C in winter, that was the original 5W-20, in Summer he used 10W-40 or 20W-50 as per the O.M.
In the 1960's 20w was the preferred oil for GM vehicles. I could never wrap my head around that one. But I drove Ford's and Mopar's!
Originally Posted By: Virtus_Probi
What was the recommended OCI, 1000 miles?
;^)
OCI was 4 months or 6k, except in special driving conditions:
Edit: driving in Phoenix would pose both temperature and dust issues for the Cad!
What was the recommended OCI, 1000 miles?
;^)
OCI was 4 months or 6k, except in special driving conditions:
Edit: driving in Phoenix would pose both temperature and dust issues for the Cad!
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They have 10w40 posted 2x. Does it mention about cutting oil with kerosene in extreely cold temps? I have seen that too.
Originally Posted By: ka9mnx
In the 1960's 20w was the preferred oil for GM vehicles. I could never wrap my head around that one. But I drove Ford's and Mopar's!
When I was a kid , on the farm , Dad only bought Gulf oil from the Gulf distributor he bought propane from . Only 20 weight , for the car and tractor . He was very particular about oil changes . The money came out of his back pocket and he took care of his equipment .
In the 1960's 20w was the preferred oil for GM vehicles. I could never wrap my head around that one. But I drove Ford's and Mopar's!
When I was a kid , on the farm , Dad only bought Gulf oil from the Gulf distributor he bought propane from . Only 20 weight , for the car and tractor . He was very particular about oil changes . The money came out of his back pocket and he took care of his equipment .
The 5W30 is listed twice-for below 20F & up to 60F! Oils have improved immensely in the last 50 years-those recommendations are all based on Group I oils. Any modern major multi grade (like a 0W40) could cover all those temperatures easily.
Back in the 50's, 60's, and 70's, a person would be best off using only the same oil the engine maker used in field durability tests, the exact brand and weight based on winter vs. summer testing.
These days, specs like dexos1, SN, 229.5, etc. allow better qualifications for oils to prove themselves across multiple brands.
These days, specs like dexos1, SN, 229.5, etc. allow better qualifications for oils to prove themselves across multiple brands.
I used 5W-20 in my 1972 F-100 PU in Alaska while stationed at a radar site there in the early 70's. Still needed 2 - 750W engine heaters or it would not start below zero. (Also had a 100w battery blanket and 800W interior warmer)
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I think most people would be surprised just how far back these specs go....
Originally Posted By: MotoTribologist
I think most people would be surprised just how far back these specs go....
I think most people would be surprised just how far back these specs go....
Originally Posted By: bbhero
Post of the week winner here
And possibly post of the year.
That is a fact!
Post of the week winner here
That is a fact!
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