good read cass! hmm I wonder at what intervals that type of oil would need to be changed?

 

0w40 mobil 1

 

im a little late, just cruising around, i use royal purple 5w30, change 3-4k miles

 

rotella 5-40 synthetic. Used in our semi's with over a million miles on them. Used it in all my race bike engines for 15 years now.

There are a couple research projects from universities studying the property of oils and rotella synthetic has rated highest on all that i have read so that's enough evidence to tell me it's a great oil. could there be a better oil, ya, but i trust my results, results from others and the research on it so i'm good with my choice.

The bike race engines are 19k rpm redline and usually don't drop below 16k rpms during races so the oil works pretty good.

 

Was personally running 10w-40 of various brands, but recently went to 15w-50 mobil one synthetic to help oil pressure when really heating up the oil... Been pleased so far.

 

Not a big fan of synthetic...when motor was stock I used synthetic and changed oil every 2800miles and not driven hard at all...pulled head when I decided to build the motor and the cams were chewed all to pieces like it had been starved of oil on the heads when I pulled motor cars dipstick still read full and drained 4.75 quarts to be exact, not too bad...so only thing I can think Of was cams were dry when I would start the car up...well replaced cams built the motor and had been running 10w40 regular mobil along with 1/2 quart of Lucas oil stabilizer (HIGHLY Recommended) but pulled motor again to rebuild during last winter and everything was perfectly smooth on the cams and no sign of starvation or wear at all...so I see no benefit to synthetic on a built motor...I recommend 6 1/4 qts regular conventional oil, now running 10w30 and 1/2qt Lucas stabilizer...Also my friend is running this setup on his 1200whp supra for 3 years now and motor with 15k miles on it still going strong as well at the 650whp scion tc we built which has 10k on the motor and still running perfect...

Btw here's a vid of the tc we built, oh and it's my friends girlfriends car she drives daily lol http://m.youtube.com/index?desktop_uri=%2F&gl=US#/home

 

Mobil1 10w30/40 whatever is available

 

Could have been something clogging the oil passages in the heads or it could have been a bad machining match from the factory. My oem block had RTV clogging the oil gally on one of my cams so they aren't always goign to do a great job assembling them at the factory.