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They cannot deny your warranty because of the motor oil you used. They cannot deny your warranty because you did not have the dealership change your oil. As long as the oil meets the current rating,(SN, CK, or whatever that engine specs) you can use whatever you want.

K-Mart 20w-50 for a oil burner I had. Bought it by the case, 12qts.

Price. Availability. That’s it. Those are the reasons. Pretty simple. When a single oil change requires as much as 20gal of motor oil price is the number one factor. Next is can we never run out? They are willing to use any brand of motor oil, they just need to know when to change it. They are...

I understand exactly what you were asking in your original question. As a engine wears it stands to reason that the oil needs to be changed more often. At what miles does it start to need to be changed at 8k instead of 10k? Only a oil sample could tell you that. Now lets assume from day one a...

GM and Ford. All well over 200k.

I am a fleet manager and it is my experience that the maintence monitoring systems that recommend oil changes based on driving conditions shorten the oil change intervals as the engine ages. Brand new van, oil life monitor comes on around 8000 miles. As the engine racks up miles the oil life...

My 1997 Land Rover Discovery owners manual said 5w-30 for North America and 20w-60 for the Middle East and other extreme hot climates. It also said that mono 30w and 40w oils were acceptable at temps above 40F.

Shell Rotella T6 5w-40, it’ll take anything you throw at it.

If only I had photoshop, or a computer…🤷🏻‍♂️

Just changed my oil today, this is the dipstick before I drained it. 5,xxx miles, Fram Ultra oil filter.

I don’t know for sure, I am assuming a better additive package.

Sorry, I did not realize they changed the name. Black bottle. Used to be called Syntec. I buy the European Formula.

Full synthetic. Every 5k or once a year, whichever is first. Done.

I use Castrol Syntec 5w-30 in my Land Cruiser, every 5k for oil changes. I use my truck HARD, the dunes, it’s loaded with 200lbs of tools and gear 24/7. Sub zero temps, upper 90’s for summer temps. Pulling my guys and their 15,000 lbs delivery vans out of the ditch… Long trips on the expressway...

It all depends on what the application is. Remember that the EPA dictates MPG standards and the manufactures have to compromise MPG with engine life. 5w-20 will get you the best MPG but shortest engine life under high load and high rpm. So the compromise? 10w-30. They assume that you are going...

12 months or 5,000 miles, which ever is sooner. Done.

I ordered more sample kits from Blackstone and I am going to do PM’s on 3 of my trucks out of state. One GM, one Ford and one Cummins. What I will not know though is the oil used in each or the miles on each oil sample. I am going to do these myself so I know for a fact the samples will not...

No, I’m going to stick with the 10k PM’s, it is easy to schedule that way and allows me wiggle room for tough times or when I can’t get a truck off the road for a PM. I just go by the OD, 10,xxx, 20,xxx, I do not worry about the 100’s, this time the oil gets changed at 39,987 and next time it...

Update. My oil sample is back. 15w-40 synthetic blend diesel oil. Ford 7.3L gasoline V8. NAPA Gold oil filter. 10,000 mile PM’s. Delivery van, on the road 6-7 days a week. 50,000 miles on the van at time of sample.

When I was in high school I had a Chevy Monza that burned 1qt of oil every 50 miles or so. So I bought a case of K-Mart brand 20w-50 and started adding it, I never checked the oil, just added every 50 miles or so. It stopped burning oil, I only figured it out after the oil started coming out...