Any reason to NOT switch to 5w30?

[Joker328]

This is from the Z4 manual.

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[Tsuki8]

Thanks, realized I spoke before searching:
Found a very nice thread/post on it:
https://www.supramkv.com/threads/toyota-gr-supra-owner-manual-navigation.1845/

Deleted my initial post but not before you replied lol.
Anyways from a Europe manual (MY21, B58TU1 or updated motor):

This is from the Z4 manual.

 

[EvilMKV]

Ok, so seems maybe 0w30 isnt an issue. Guess I'll research some more of what to make the switch to, if anything. Was looking at the oil change kits offered by FCP euro and saw a lot recommending the 5w30 oil.

 

[razorlab]

Do we really need another oil thread?

I've been using 5w-40 in my Supra since 1,500 miles. 24 track days. Oil reports come back fine.

The Supra GT4 also uses 5w-40

 

[lucky phil]

Do we really need another oil thread?

I've been using 5w-40 in my Supra since 1,500 miles. 24 track days. Oil reports come back fine.

The Supra GT4 also uses 5w-40

No we don't BUT oil specs keep changing. The latest SP grade oil is the one to use for a DI engine but I've found it's not readily available yet in grades over XW-30. May well be in the future. I've been using Mobil1 0W-40 for 16 year in just about every vehicle I own including track bikes but I don't think it's SP rated yet.

Phil

 

[Loco38SUP]

No reason not to other than letting the Net nannies scare you. Change to 5w-30 and send it…

-RJM

 

[lucky phil]

No reason not to other than letting the Net nannies scare you. Change to 5w-30 and send it…

-RJM

I did a tour of the BMW 3 series factory in Munich back in the mid 80's. I had a friend that worked for BMW as a supervisor in the plant that made the press tools for stamping out body panels.
Here's how a 3 series rolled off the production line back then. Driven off the line after the last task, wheel alignment and straight into the rolling road room, one of quite a few. Doors close and rollers ascend out of the floor. Technician accelerates the car ( manual) through the gears at WOT and hits around 180 kph ( there was a large screen just outside the drivers door displaying data including road speed etc. He holds it wide open for maybe 30 seconds as he ticks off his checklist of interior stuff to make sure it works then gets off the gas, bangs it down through the gears with the old 3 series bouncing off the side rollers and hits the brakes firmly to test them out. The rollers then retract and it's driven out of the rolling road room to end up at the new owners home somewhere in the world that's sweating on not exceeding the manufacturers running in rpm or driving directions. Pretty funny I thought.

Phil

 

[Supra_UK_]

I did a tour of the BMW 3 series factory in Munich back in the mid 80's. I had a friend that worked for BMW as a supervisor in the plant that made the press tools for stamping out body panels.
Here's how a 3 series rolled off the production line back then. Driven off the line after the last task, wheel alignment and straight into the rolling road room, one of quite a few. Doors close and rollers ascend out of the floor. Technician accelerates the car ( manual) through the gears at WOT and hits around 180 kph ( there was a large screen just outside the drivers door displaying data including road speed etc. He holds it wide open for maybe 30 seconds as he ticks off his checklist of interior stuff to make sure it works then gets off the gas, bangs it down through the gears with the old 3 series bouncing off the side rollers and hits the brakes firmly to test them out. The rollers then retract and it's driven out of the rolling road room to end up at the new owners home somewhere in the world that's sweating on not exceeding the manufacturers running in rpm or driving directions. Pretty funny I thought.

Phil

I love watching these videos on Youtube of car production lines, including the final rollers process you mentioned.

Can I ask then since you are knowledgeable, why in your opinion do they do this?

Why is it ok to do at the factory, but they recommend not to for customers?

 

[FLtrackdays]

I love watching these videos on Youtube of car production lines, including the final rollers process you mentioned.

Can I ask then since you are knowledgeable, why in your opinion do they do this?

Why is it ok to do at the factory, but they recommend not to for customers?

Fuel savings, legal, one size fits all. I get it.

If I never varied from OEM I’d have a lot shorter track days. Brake pads, tires, you name it. Lot of common sense can go a long way for individual use. This applies to more than just vehicles

 

[Joebednar4]

So many people going against manufacturer recommended oil viscosities just because they “feel” the recommended oil is too thin because they do occasional autocross or track days.

I’ll start by saying I have no problem with anyone using whatever oil or other products they want in their vehicle. That said, I think changing oil viscosity based on “feelings” or anecdotal Internet comments is a waste. The recommended oil viscosity is selected based on the bearing clearances and oil flow characteristics specified for the engine. Unless you’ve changed engine internals or seen through oil analysis that your oil is shearing down to a lower viscosity then I don’t really see a need to change oil viscosity on a stock engine. Even if you do, it’s probably better to change it before and after each track session if you’re really pushing the powertrain since you could do oil analysis to get early warning signs of excessive wear, damage, or how well your selected oil is performing.

You left out recommended oil viscosity due to epa regulated mpg. 0W/16 is a direct result of needing higher mpg to meet regulations. 0W/20 isn't far off of that. Spinning a crankshaft through 5W/40 takes significantly more power than spinning it through 0W/20. Likely the cause of peoples lower mpg after changing. To be fair, too, this action of changing oil recommendations pre-dates the MK1 Supra and plenty of other cars. Hod Rodders and builders have been doing it forever. The chances that it has anything to do with valve clearances are very slim...like valve clearances, lol.

 

[CrimsonSupra]

You left out recommended oil viscosity due to epa regulated mpg. 0W/16 is a direct result of needing higher mpg to meet regulations. 0W/20 isn't far off of that. Spinning a crankshaft through 5W/40 takes significantly more power than spinning it through 0W/20. Likely the cause of peoples lower mpg after changing. To be fair, too, this action of changing oil recommendations pre-dates the MK1 Supra and plenty of other cars. Hod Rodders and builders have been doing it forever. The chances that it has anything to do with valve clearances are very slim...like valve clearances, lol.

Regardless of the EPA, engine engineering and oil formulation as well as viscosity go hand in hand.

There are many valid reasons for running different viscosities, but “because x viscosity is like water” or because “grand pappy ran 60w in his hot rodded Ford Flathead” are not objective arguments. That’s about the extent of many comments around the “best oil” though.

 

[J29DB03]

So if oil has gotten thinner due to EPA requirements, then why wouldn’t vehicle manufacturers design and build their engines to the oil spec needed to meet those requirements?

 

[EvilMKV]

The more I read, the more I think I'll just switch to Liquid Moly 6660 0w20 and if a track day is coming up, I'll just make sure it's got a fresh oil change before hand like I usually do.

 

[bushido]

The more I read, the more I think I'll just switch to Liquid Moly 6660 0w20 and if a track day is coming up, I'll just make sure it's got a fresh oil change before hand like I usually do.

brake fluid will have greater importance. also, both clutch and brake fluid share the same reservoir. get some react srf in there

 

[Joebednar4]

Regardless of the EPA, engine engineering and oil formulation as well as viscosity go hand in hand.

There are many valid reasons for running different viscosities, but “because x viscosity is like water” or because “grand pappy ran 60w in his hot rodded Ford Flathead” are not objective arguments. That’s about the extent of many comments around the “best oil” though.

Lmao, seriously? Love your passive aggressive dickery there, but you've literally added nothing to this conversation besides "read the manual". So incredibly helpful you. Bet you're a ton of fun at parties.

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