What oil to use on my new engine

[Young Whitey]

I would think about using a diesel oil like chevron delo, mobil delvac, or shell rotella for break in if you want to go conventional at first. They are sturdy, can hold lots of crap, and are loaded with additives. 15w40 diesel would be goods over the long run too especially if youre not running cats. Personally I dont think its a problem to go straight to synth. Can manufacturers do it, and Ive always switched to synth before 1000 miles on my cars with no problems (no consumption, etc). I always monitor with oil analysis.

[geoffinbc]

My mechanic is recomending 10w 40 castrol, what do you guys think, please read the first post to see my mods

There is no reason to run a 10W oil. 5W flows better at startup which is better for bearing protection and cold starts.

[Young Whitey]

The bigger the spread between the two numbers the more likely the oil is to shear and end up a much lighter weight oil than advertised.

[ezrollin]

Mobil 1 is inferior ? Please ! Is that why it comes in so many new cars ? Pick a name brand you trust and go by their recommendations for viscosity and feq. of change. I had a Ford 4.6 that blew a head gasket due to wp failure. With over 100,000 miles. The wear was so minimal that I was able to use standard rings,bearings etc. for my rebuild, having changed the oil,oil & air filter every 5000 miles ,of course adding oil when needed.

[Superdave]

i'm using 5w30 Penzoil, nothing special... but i plan on switching to Quaker State full synthetic after i hit the 1000 mile mark... 150 miles to go!

[Rhedalert]

Mobil 1 is inferior ? Please ! Is that why it comes in so many new cars ? Pick a name brand you trust and go by their recommendations for viscosity and feq. of change. I had a Ford 4.6 that blew a head gasket due to wp failure. With over 100,000 miles. The wear was so minimal that I was able to use standard rings,bearings etc. for my rebuild, having changed the oil,oil & air filter every 5000 miles ,of course adding oil when needed.

How much do you think GM gets paid to market Mobil 1 to their new cars? I won't get into it, but do a little research on Mobil 1 on the net and you'll see the real story. I used to use Mobil 1 solely on all my vehicles. Now I use better oils for the same price or less.

[sprucegagt]

Mobil 1 is inferior ? Please ! Is that why it comes in so many new cars ? Pick a name brand you trust and go by their recommendations for viscosity and feq. of change. I had a Ford 4.6 that blew a head gasket due to wp failure. With over 100,000 miles. The wear was so minimal that I was able to use standard rings,bearings etc. for my rebuild, having changed the oil,oil & air filter every 5000 miles ,of course adding oil when needed.

Mobil 1 is not the same as it used to be. It's now a lesser grade oil then, I believe, either Mobil's "Extended Performance" line or "Clean" line.

[geoffinbc]

The Mobil 1 synthetic is still a great oil. I would pick Redline or AMSoil over it but they do cost more.

[ezrollin]

The Mobil 1 synthetic is still a great oil. I would pick Redline or AMSoil over it but they do cost more. Exactly,and if you feel better with Redline or AMSoil great,either way your engine will be fine!