what oil for the hot rod

[RDY4WAR]

Mobil 1 Supercar 5w-50 is corvette and zl1 approved so corvette or srt similar application imo.

Why get a 15w-50 if a 5w-50 is available? Won’t a 5w act like a 15w at a specified temp just the 5 can go colder ie has a colder pour point ? What benefit does a 15w have over a5w ?

In terms of a common brands off the shelf, the 15W-50 will contain less viscosity index improver (VII) polymer with a higher viscosity base oil blend which would make it more shear stable. The trade-off is less capable in cold weather.

I don't see any reason to use a 50 grade oil over a 40 grade in your engine. I think it'll just rob a little bit of power for no positive trade-off.

 

[Japanese]

If you keep the car in a garage, even if it's not heated, temp. inside will be at least 5-10*F warmer than the outside temp. If the garage is adjacent to a house it could be even warmer.

Regardless of that, definitely go with synthetic 5W or 10W grade. If the garage temp. goes below 20*F stick with 5W oil.

 

[duke9074]

That engine is a prime candidate for HPL Bad Ass 5W-40. It checks all of the boxes you're looking for.

HPL's standard for rust prevention is far above anything you'll find on the shelf as they test to 24 hours in saltwater (and ace it) where as most oils on the shelf are just 4 hours in freshwater. (typical API standard) Their standard for foam is 0 ml which is great for 7200 rpm. That oil will take all the heat you can throw at it. It doesn't even reach peak friction coefficient until 305°F, much less thermal breakdown. It's really good at holding a film on parts so sitting for long periods of time won't be a concern. It's a tri-synthetic with a complete DI pack so it runs clean.

This is a great bit of info packing a punch, is there an analysis or spec sheet for this oil? Curious how it lines up compared to the current oil I use which I’ve always used due to there claim of Military spec storage and rust/corrosion prevention.

Also thank you for the info and detail about shear stability and the trade off of temperature window per se. So a 5w-40 would be more stable similar to a 15-50 both are 35 points per se on a chart? Is that a logical/fair comparison?

I do like the idea of having a 5w if needed if not it can never hurt to my understanding?

 

[duke9074]

If you keep the car in a garage, even if it's not heated, temp. inside will be at least 5-10*F warmer than the outside temp. If the garage is adjacent to a house it could be even warmer.

Regardless of that, definitely go with synthetic 5W or 10W grade. If the garage temp. goes below 20*F stick with 5W oil.

Yes garage kept yes the garage goes below freezing. Yes it attached to a house, NY winters can get cold.

 

[MParr]

What about Motorcraft 5W50 Full Synthetic?

 

[97prizm]

So the great debate on what oil i should start using. Looking to go to a synthetic due to oil temps, and broad ambient temp use. Summer oil temp was getting close to 270s on a 7qt moroso. Car is a 1991 ford mustang with a built aftermarket engine. She gets decent use but not weekly and less frequent once the cold north east winter hits, also sees some storage time once the snow and salt fall.
Motor Specs are as follow,
dart shp 351w block stroked to 427 full roller setup. eagle comp forged rotating assembly. mel high volume oil pump. manley pushrods. Je pistons. comp cams solid roller. brodix aluminum heads. its a 9.5 deck with 10.2:1 compression. Main clearance .024 and .004 end play. 7200 rpm limiter

cam specs intake lift .673 exhaust .673
timing at .05 intake opens 26btdc close 58atdc
exhaust opens 70 btdc closes 22atdc
intake duration at .05 264 exhaust 272
lobe lift .421 lob sep 110

I was thinking a 10w40 but figured although hard to find a 5w-50 may be better. I understand zinc and phosphate are not needed on the roller setup but still do prefer them like most would. I am concerned with corrosion, rust prevention, initial start up after sitting 2-3 weeks regularly and winter storage 6-8 weeks, as well as cold start? Thoughts opinions? HPL, RedLine, LiquidMoly, Driven HR series, or just some mobil 1 supercar corvette oil?

Valvoline VR-1 or RP race.oil, or VP Racing oil. I picked up the VP Racing 10w-40 for my RX-7 race car years ago for SCCA Racing.

 

[duke9074]

What about Motorcraft 5W50 Full Synthetic?

Reboxed oil mostlikely Mobil 1 as I believe that’s approved for them as well

 

[Japanese]

Why get a 15w-50 if a 5w-50 is available? Won’t a 5w act like a 15w at a specified temp just the 5 can go colder ie has a colder pour point ? What benefit does a 15w have over a5w ?

The main difference is that 5W-50 at -30°C/-22°F has the same CCS (cold cranking simulator) viscosity as 15W-50 at -20°C/-4°F. In your case where cold star is considered, I would chose the 5W-50. Also people on here say that same Castrol oil is used in Ford track cars.

Castrol Edge 5W-50, PDS
On paper looks like thick 5W-40 oil.
https://msdspds.castrol.com/bpglis/...6BA90B180258C2F003E2950/$File/wepp-dduf74.pdf

Amsoil Dominator Racing 15W-50 PDS, (2nd page, 4th column oil)
https://amsoilcontent.com/ams/lit/databulletins/g2990.pdf

 

[We're Metals]

We're going to be back at Mobil 1 15w-50 any moment!! Go with the tried and true like your mullet luving 80s sports car.

looking for a winter weight of 5 or 10 as apposed to 15/20 ...... car is started at and below freezing temps to move out of the garage or to give her a winter leg stretch. I can find the 5w or 10w weights but am concerned on the storage and cold start protection.

5w vs 10w vs 15w vs 20w ye aint goinna be sidewayz in the snow for long my brotha. Ya gotta start thinking with ya dipstick!

 

[duke9074]

We're going to be back at Mobil 1 15w-50 any moment!! Go with the tried and true like your mullet luving 80s sports car.



5w vs 10w vs 15w vs 20w ye aint goinna be sidewayz in the snow for long my brotha. Ya gotta start thinking with ya dipstick!

Thinking with your dipstick is how we end up in these predicaments. Haha snow car doesn’t have any idea what that or salt is. That being said the cold is cold but yeah she’s not seeing -22 or -4 lucky to see 20 more like freezing and above just to get the juices flowing for a mid winter stretch.

That being said I originally said my main concern was storage and long intervals, as well as rust/corrosion prevention. The knowledge of weight viscosity’s and all the factors is great too. 5w is probably great if it ever sees that super cold then again if that 5w isn’t as well of a storage oil vs a 10w that storage time is probably more damaging than that one or two cold starts on a 10w. After all she’s never seen abuse with an oil temp below 140.

 

[ripcord]

15w pumps fine down to 5f, FYI.

 

[MParr]

Reboxed oil mostlikely Mobil 1 as I believe that’s approved for them as well

Motorcraft is a Phillips 66 product.

 

[We're Metals]

Thinking with your dipstick is how we end up in these predicaments. Haha snow car doesn’t have any idea what that or salt is. That being said the cold is cold but yeah she’s not seeing -22 or -4 lucky to see 20 more like freezing and above just to get the juices flowing for a mid winter stretch.

That being said I originally said my main concern was storage and long intervals, as well as rust/corrosion prevention. The knowledge of weight viscosity’s and all the factors is great too. 5w is probably great if it ever sees that super cold then again if that 5w isn’t as well of a storage oil vs a 10w that storage time is probably more damaging than that one or two cold starts on a 10w. After all she’s never seen abuse with an oil temp below 140.

Brother you gotta think back to your fellow rednecks of long lost past. They done not worry about rust in they engines but power beneath their Bf Goodrich's. Rest your mullett gently knowing your engine is guarded safely with that sweet sweet crude.

The boat anchor wont know the difference above -20 degrees between 0w 5w 10w 15w 20w. Thas what we tryina tell you brotha. Now get that cowl induction junk hood latched down and hit the road west to them warmer temperatures

 

[kschachn]

That being said I originally said my main concern was storage and long intervals, as well as rust/corrosion prevention. The knowledge of weight viscosity’s and all the factors is great too. 5w is probably great if it ever sees that super cold then again if that 5w isn’t as well of a storage oil vs a 10w that storage time is probably more damaging than that one or two cold starts on a 10w. After all she’s never seen abuse with an oil temp below 140.

That makes zero difference in storage.

 

[duke9074]

That makes zero difference in storage.

Perhaps you misread that, I’m not saying a 5w can be better for storage than a 10w. I’m saying having the benefits of 5w probably doesn’t outweigh having a better storage oil that may only come in a 10w. If you don’t start the car when the 5w is needed it’s moog.

 

[kschachn]

Perhaps you misread that, I’m not saying a 5w can be better for storage than a 10w. I’m saying having the benefits of 5w probably doesn’t outweigh having a better storage oil that may only come in a 10w. If you don’t start the car when the 5w is needed it’s moog.

Sorry yes you are correct.

 

[thastinger]

So the great debate on what oil i should start using. Looking to go to a synthetic due to oil temps, and broad ambient temp use. Summer oil temp was getting close to 270s on a 7qt moroso. Car is a 1991 ford mustang with a built aftermarket engine. She gets decent use but not weekly and less frequent once the cold north east winter hits, also sees some storage time once the snow and salt fall.
Motor Specs are as follow,
dart shp 351w block stroked to 427 full roller setup. eagle comp forged rotating assembly. mel high volume oil pump. manley pushrods. Je pistons. comp cams solid roller. brodix aluminum heads. its a 9.5 deck with 10.2:1 compression. Main clearance .024 and .004 end play. 7200 rpm limiter

cam specs intake lift .673 exhaust .673
timing at .05 intake opens 26btdc close 58atdc
exhaust opens 70 btdc closes 22atdc
intake duration at .05 264 exhaust 272
lobe lift .421 lob sep 110

I was thinking a 10w40 but figured although hard to find a 5w-50 may be better. I understand zinc and phosphate are not needed on the roller setup but still do prefer them like most would. I am concerned with corrosion, rust prevention, initial start up after sitting 2-3 weeks regularly and winter storage 6-8 weeks, as well as cold start? Thoughts opinions? HPL, RedLine, LiquidMoly, Driven HR series, or just some mobil 1 supercar corvette oil?

I'm guessing that main bearing clearance you listed is missing a zero?

 

[duke9074]

Well I hope so but yes .0024,.0023 depending on the main