VCCA Home Forums GENERAL DISCUSSION General Discussions High Mileage Oil vs Conventional Oil??

Anybody out there have any experience with the "High Mileage" motor oil out there?

I've been running conventional oil in my daily driver, but now that it has 130K+ miles, am considering the switch. She uses about a quart every 1K miles, which isn't bad. I always maintained my Silverado with faithful oil changes since I bought it new.

Just wondering if the high mileage really is true to all the hype and claims of preserving seals. Also, is this synthetic or a blend? I see most oils say blend now.
Puzzled in San Diego.

Most brands of high mileage oil contains extra amouints of neoprene seal sweller, detergent, zinc and other desireable additives. Also the viscosity is at the top end of the required range.
Due the tthe above it does not meet the specs of the oil required for SN rating

At one time I thought it was a "nothing" but after research I believe there is a place for it.

My daily drivers get regular oil changes at 5000 miles with the syndetic oil that is on sale. Generally my local NAPA has a bi yearly case sale on their store brand and that is when I stock up. I look that it is an approved oil that meets what is recommended.

My truck had 240,000 miles on it when the transmission gave out. Used the same oil change regiment. Since it was burning some and had the GM lifter tick I was adding half a quart of Lucas oil treatment with each change. When using that I was burning a quart every 5k and not 2qt. It also stopped the tick as long as the truck did not sit more than a couple days.

I believe that a quality oil changed at regular intervals is the most important thing. In my trucks case I used an additive since it had a tick and was burning oil. The motor never did give up. Only reason I have not tried the high mileage was it is not in the case sale.

Thanks Gene and Mr. 87 for the replies.

I agree that with faithful oil changes, getting 240K+ miles is not unusual. I also think that changing transmission fluid at required intervals is also crucial, as long as it's not over filled.

I'll check the service rating to make sure the oil meets the min required for my 2009. Good points all.

Happy July 4th all!

I only use the regular oils of any brand with regular 10,000 klm (6,000 mile) change, the engine now has 500,000 klm (300,000 mile) on it only using about a qt of oil between changes but compression is very down on what it should be.
Tony

Finding regular oil in my area is now a task. Lots of synthetics, semi-synthetics. and high mileage oils but regular 10-30 detergent is tough to find even at places like Tractor Supply and Walmart.

Chev Nut--should I be concerned with higher levels of zinc? I don't want to damage my cat converter. I would assume since it has a modern oil rating the levels are still within safe limits for cat converters??

Food for thought.

Your assumption about non-damaging levels of zinc and other additives such as phosphorous is correct.

Otherwise the oil could not carry the SM or newer rating.

I am not sure about the US but here in Aus it was the late 1980's before cat convertors were introduced so most of our Chevs dont have that problem.
Tony