What grade oil should I use? (Attn: autxr)

[DaksGT]

Right now I'm running 15w50 mobil 1 synthetic. Should I stay with the same oil grade switch to a different one during winter etc...

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2001 Liquid Silver Celica GT 5 spd
1993 Milano Red Civic Hatchback GSR

[LovinDaCamSwitch]

The oil your using is fine, but make sure you stay with synthetic. That one thing you shouldn't have gone with. The best thing to use is synthetic blend not full synthetic. Your celica isn't require full synthetic for one thing. The oil using is fine "15w 50", just make sure you don't change back to regular oil than synthetic oil. I'm hoping your using the blend stuff. Let me know if you are.
Dan

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2000 Celica GT-S
MODS: A.E.M C.A.I,5Zigen exhaust,short shifter,carbon fiber dash,Rod Millen carbon fiber hood scoop.
Furture MODS: Springs,Tanabe front upper strut bar,Tanabe front and back lower tie bar

[autxr]

15 weight is too heavy for a Canadian winter.

Switch to a 5W30, probably do it ASAP in all honest.

I run 10-30 year round in North Carolina, I used to run 20-50 in the summer, but have researched it further and decided I was doing more harm than good. Now it is 10-30 year round.

But, a cold morning here is 20 deg F and my car is garaged, soa cold start might be 40 or 50 F.

As ofr the kind of oil, I run full synthetic. At <5000 mile change intervals I could run 50 cents a quart no name oil and get 200,000 mile sout of the engine.

As for switching back and forth, blended regular syn thetic, you can switch all day every day if you want.

Use the best oil you think you can afford.

Scott

[CloNeGTS]

The book says 5-30.....that's what I use. I don't want her swinging around in maple syrup when I need her to start here in a month.

Oh yeah, Mobil 1 all the way.....18 bucks for a 5 quart bottle at WalMart.

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[yakkosmurf]

You really should go by the book. Who knows your engine's lubrication needs better than the engineers who designed it? We mechanical engineers take classes on how to determine lubrication requirements for machines. Have you taken these classes? Then why do you think you'd know better what to use?

If you use a synthetic 5W-30, the operating range of the oil will be fine for even the most extreme hot weather and also be good for all but the coldest winters in the northern US. You could switch to a thicker oil for track visits (I'm talking long days of road racing or autocross, not a few runs down the drag strip), but I would change back to 5W-30 once you get home from the track. I personally use Mobil 1, but any major brand of synthetic will be just fine.