I run Valvoline fully synthetic in mine and also in my jeep no complaints about it. It actually quieted my jeeps lifters too.

 

Always ran Mobil 1 on my Camaro. After 130,000 miles decided to put in some goodies and tore the entire engine down. There was almost no wear on any components. I could have easily reused any of my lower end parts for my cam swap, rod, main, and cam bearings all had minimal amount of wear. But decided to freshen everything up while it was apart anyway. After seeing that, I'm sticking with it.

 

you too? I've found that helps with the leaky seals, sometimes I use tranny fluid to clean the engine as well

but seriously, I've used Mobil 1 5W30 for a long time (10+ years) without any issues

 

Mobil 1 synthetic is the best IMO. Mobil uses a much more thorough process of removing the wax from the oil and they also use additives that give it a prolonged life compared to other brands.

Mainly though its the removal of the wax that makes mobil 1 better. They are actually the largest supplier of wax in the world.
Don't put it in a newly built motor though because it actually lubricates so well that it will actually almost prevent your motor from breaking in.

Also I wouldn't use Castrol. It is a refined oil and pretty crappy IMO. I imagine thats why castrol compares their synthetic to other brands conventional oils.

 

sand and metal shavings add at least 15 rwhp I heard

 

^ This is true....

haha, I've ran M1 5W-30 from day uno as well. Engine has survived 12 years now, and counting. Typical Canadian built chevy

 

I start my cold motor with the gas pedal on the floor, since there is no oil being thrown up to the pistons right away, the rings wear and there is less friction= more HP!!

 

Many, many years ago, wintertime, I needed to change the oil in my car before leaving on a trip up north to go snowmobling. It was about -20° in my unheated garage, where I stored my oil. I opened up the first can (that's how long ago it was) of big Q 10W30, it would not pour out of the can, I had to bring the cans into the house for a few hours to complete the oil change. Then I heard about Mobil 1, developed when they were building the Alaska pipeline. The stuff pours like water at twenty below, been using it ever since. Thanks, Douglas

 

Sounds like only about 2 of you have done any real research on the topic and the rest of you are basing decisions on marketing.

Tearing an engine down and having it look good doesn't mean a lot, cammed a 160K mile cop car and all looked good inside far as we know it has never had synthetic.

 

so your basing your opinion on a hunch? that sounds like a solid foundation to base an opinion on, better than everyone else's evaluation here in this thread

 

Well, I'm looking at an oil test, which convinced me to NOT USE
Mobil 1 again! The wear test showed that Mobil 1 performed worse
than some oils half its price. I've since switched to Royal Purple.

 

Mobil 1 doesn't have waxes because it's not paraffin based. It's made from olefins. It has no waxes to remove. An excellent quality.

The wear tests! I wonder if M-1 shows more bearing wear traces because it picks up and keeps in suspension the wear remnants that the previous brand of oil left behind in the galleries and returns?

 

No my opinions are based on real research, as well as having been inside a number of LT1s and all looked pretty good reguardless of history. Analysis of USED oil to see the wear metal content is the best measure we have and most of you ignore it. The reviews guys are giving here are as good as SOTP "measures" for speed mods, means nothing, think of Used Oil Analysis as dyno and track measurements for oil performance.

On the cop car I said "far as we know" because I was not trying to make a firm statement because I was aware I had no solid info on that case. Seems assinine to think the police would have used sythetic though, ALL police mechanics I have ever spoken too said they use bulk oil, 55gallon drums of dino changed regularly. I have not spoken to one who worked on this car though as it came out of upstate NY. Outside of the block is nasy we broke all kinds of fasteners

 

Friend Dwayne, if cop cars had in-house maintenance, I'd agree with you. But don't forget, cop cars don't operate in the real world, most never sat overnite in -20° temps. They also had very severe service, idling most of the time, I would imagine oil changes were frequent, probably had a hour clock timer rather than milage for oil. Frequent oil changes are the lifeblood of any engine, just because I use Mobil One don't mean I stretch out intervals. On some new GM cars, there is a Mobil One sticker on the fill cap, if it's good enough for the General, it's good enough for me. This don't mean much, but I had a 1985 Caprice that had well over 300,000 miles on it when I finally got rid of it, never touched the engine. Was it because of Mobil One, who knows? Thanks, Douglas

 

I think Mobil1 is a good oil, but I also think there are better oils. That's why I'm switching to German Castrol in my LT1. I also run that oil in my 2001 4.7L Jeep. My last interval in the Jeep was Mobil1 0W-40. I'm curious to see how the analysis of that oil comes out.