smee123

Any decent synth can withstand sump temps of 300+ FYI. I started running Castrol edge professional 5w40 or 0w40 once mobil 1 switched the formulation of their 0w40 years back. My comment was in reference to what FCA was seeing in their ram 1500 eco diesels trucks over prolonged use.

noodels

Oil has a <run in> period changing it to often will not help performance..

S2000_916

you guys should give pennzoil platinum 10w30 a try. i have 163k 2001 ap1 and no oil burning issues. pennzoil always has rebates and you can get this oil for 10-15 bucks a 5 quart jug.

engifineer

Would love a reliable source on that. I have heard this once before and have never heard reliable info to back that up. To the contrary, the engine builders and mechanics I know say the exact opposite. I have always thought this was a myth (as a matter of fact I have only heard this once before your post and checked it then) but at least gave it the benefit of doubt until talking to others in the field. If you can provide a reliable source I am happy to read that

smee123

I am going to second this. Never heard of that before either. If indeed oil had a run in period, most race motors would be fkd.

yamahaSHO

Oil does require heat and pressure for some additives to be broken in, which is actually pretty common.

smee123

Oil additives, whatever they may be, are activated by reacting with metal surfaces when temps are elevated due to pressure. I don't think it has anything to do with them being broken in.

noodels

That's a better way of putting it
Building a boundary layer is shown here
https://www.bobistheoilguy.com/states-of-lubrication/

yamahaSHO

You can call it whatever you want, but it still is something that happens with new oil.

smee123

The additives form new compounds when they react with the metal at high temps. You and I are saying the same thing.