Hey guys, well, I bought an 89 IROC a few months back and the motor had been rebuilt. The owner at the time was running Kendal 20-50 in it. I thought that was a little high, its now time for an oil change and I wondering what I should do. Stick with it, the car runs great, lots of power and smooth all around. Or should I switch to something else??? She doesn't leak a drop of oil, but that might be due to the heavy oil in the first place. Thanks

Will

 

Forget to mention that the motor has about 45k on the rebuild

Will

 

i run 15w-50 M1 in the heat and 10w-30M1 in cold, in dead of winter i might run 5w-30 M1.

 

Well I have ran 20-50 and sometimes straight 50 in hot summer months durring abusive times (racing) but do not forget it is in there if you live in the snow belt. Starting the engine with 20-50 when it is -10 outside will have you rebuilding it again.

 

I live in San Fran and its usually 60's all year round. Might I switch to a synthetic oil? I will go ahead and do an oil change this weekend with some more 20-50, but I was thinking of going with some synthetic after the summer months

WILL

 

That is too heavy for a street-driven car.

Get the candle-wax out of it, and use 10W-30 synthetic, and by doing so, claim your missing 4 or 5 HP and some gas mileage too.

 

Awesome..... I was thinking maybe the prev owner was trying to stop an oil leak or something with that heavy a oil in her. People used to tell me to run it in my old 86, but then again she had like 145k miles on the original motor. thanks guys, I will run some 10w30 instead. Castrol or what???

Will

 

Mobil1

 

Got it!!!

 

More like the previous owner was trying to stop a bad sound or oil consumption. M1 or AMSOIL if you can swing it.

 

I hear quite a bit of pinging, sounds like marbles in the motor bay if I floor it. Just developed recently. She never did this. and I always run 91. Maybe a bad tank of gas? Or would the oil affect this too? Thanks guys

Will

 

My moms 02 accord calls for 20w-50. Should I put something else in it in the winter??

 

After much research and a few blown fresh rebuilds on various types of synthetic I will never again break in a fresh rebuild with any thing but good ole dino and tons of assembly lube on open headers at a 1,800-2,000 rpm free first run for 45 miniutes then chage out with plain old dino oil for the first 1,500 miles.

After that ok yes mobil1 is ok but AMSOIL is the only thing I will ever use again other than dino.