Whats the best brand of motor oil?

I agree with Thomas SR. I would also like to add that using a synthetic oil may not always be best. Think about it this way. If you run an engine, contaminants form from the combustion process. Most of these contaminants are carbon particles.If you run synthetic oil it may be a better lubricant but it still gets contaminated. So they tell you that you can extend the amount of time between oil changes? Hmmmm? I have been servicing vehicles for close to 30 years in the trade. In all that time I have NEVER seen an oil related failure in an engine that had been serviced correctly no matter what type of oil used. In my personal vehicle I use a good quality 5W30 castrol GTX but would use any name brand out there. In my differentials and transfer cases I use synthetics, this is where they really shine. No contaminants so unless water or parts breakage you can leave it there forever. Just a different perspective to think about.Whats the best brand of motor oil?
Tell you what... I've worked in the automotive industry for over 17 years now, and spent ten of them managing an express-lube. I'm an ASE certified Master Technician and a CASI certified Automotive Lubrication Specialist, and what I've learned over the years is this: AS LONG AS YOU STICK WITH THE MAJOR BRANDS OF OIL YOU'RE GETTING A GOOD PRODUCT.Whats the best brand of motor oil?
with today's engine oils and technology any NAME BRAND engine oil is good, synthetic is in another whole league. if your looking for a ';good oil'; stay away from the bargain oils.
castrol gtx
castrol gtx. dont get synthetic unless its a low milage car. It can shink your seals then you'll have an oil leak.
Mobil One fully synthetic. My grandfather used this stuff in his helicopter engine. Nothing else would hold up in the engine. I use it in my personal vehicle. Change every five thousand miles. Not every three thousand. Don't need to change it after three. But check it and make sure it isn't looking bad anyway. If your engine is already old and cruddy don't waste your money on expensive oil though. But if you have a newer car, it's a good idea to use any Fully Synthetic oil. And always change your oil filter every oil change.
First, lets dispell some of the mistakes here.


Synthetics do not ';shrink'; seals and cause leaks. Synthetics are more detergent than regular oils. This causes the synthetic oils to break down the crud that is keeping already damaged seals from leaking.





Mobil 1 was a very good oil at one time. They have now changed their formula. The old formula is now their 'high milage' formula....





The 'best' brand of oil would be full synthetics. Redline, AMSOIL, and Royal Purple are three excellent oils. They are more costly per quart, but extra protection comes with that price.
I use valvoline in both my 98 chevy truck 145,000 miles and 98 jeep with 168,000 miles both receive oil changes every 5000 and both run like new a high quality filter is importen to so valvoline has done me good . you can do a simple test take a old table spoon pour different brands of oil on the spoon 1 at a time take a small hand torch and fry the under side and record how fast they turn to sludge the results are y I use valvoline
idk