Simple question ....

I was advised (by reputable company) to purchase 15w50 oil for my 2006 STI with PPP. (About to get remap expect about 340ish bhp as my torque is already at 340 without any mods)

I do a lot of miles in it (300 ish today for example) so it will get hot especially as summer approaches.

Anyway ,,,,, the simple question is ....

will this oil bugger me up or do I just need to let it warm up fully to temp before booting it ?!?!

(read many oil threads but I'm sure they're designed to confuse even more LOL)

 

You need to let any oil warm up to operating temperature before booting it, depending on weather conditions 10 miles normally does it, hotter = less but still id give it 10 miles, colder = more so 10 miles is minimum.

Tony

 

of course but doesn't 15w require a higher operating temp ....

 

I read on a website (silcoline I think) that the 15W50 is actually the operating temperatures that the oil is viscously stable at. So for example 15W50 is stable from -15C to +50C, which is why people confuse it with a differing viscosity. I'm sure someone will be along to blow this out the water soon though.

Andy.

 

15/50 is too thick for that engine under normal conditions including the quick stuff! You should not need anything more than a 10/40 and preferably a 5/40during the winter.
JohnD

 

In simple terms it means that at 0C the oil flows as a 15 weight oil would and as a 50 would at 100C

JohnD

 

Ahaaaa it's all clear now ....

 

API Impreza recomends 15/50

Im sure they know what their talking about.

 

As do Roger Clark Motorsport IIRC

 

And STi do a 15w50 rated oil as branded (Motul 300v i believe it is)

Tony

 

You should try asking whether to use synthetic, semi-synthetic or organic oil

Silkolene Pro S 5w-40 Try Opie Oils product finder.

 

just dun my oil and filter got my oil from subaru its 10/40 helix synthetic dont understand all the jargon about viscosity i just changed it and drove