Synthetic oil costs less in the long run. Yes I sell Amsoil, but Mobil 1 is the second best oil.
If you do that math, full synethtic oil costs less.
Using regular is a thing of the past. Changing your oil with a non synthic means your engine is prone to sludge and varnish as the wax and viscosity index improvers break down.
Toyota had a major issue with engines sludging up, something a full syntheic oil doesn't do. Why? Because full synthetic oils flow better, have no wax (wax causes sludge) and are far more shear stable. Full synthic oils have uniform basestocks so they dont "boil" away like non-synthics.
Yep, I remember seeing sludge scraped off the inside of the valve cover on a slant 6 many years ago because the previous owner hadn't maintained it properly.
Hmm, you haven't pointed out any factual misatkes. The only think I see is name calling. I mean if you want to keep your head stuck in the sand, then I feel very sorry for you.
Over-the-road large trucks have multiple oil filters from the factory. A full-flow paper filter to ensure the big chunks get stopped, and a depth bypass filter with packed cotton wadding to scrub all the sub-micron level dirt and soot out of the oil.
Cars only have one full-flow paper oil filter that gets down into the 15 to 10 micron dirt range, and that's still small boulders as far as the bearing surfaces are concerned.
And the trucks that leave the oil in for long periods also take an oil sample and pay for a laboratory oil analysis every 10,000 miles or so, to see if the oil is okay to leave in. Some of those engines hold
20 to 50 gallons of oil, and a change isn't cheap.
For your car, the cost of an oil analysis is more than one gallon of fresh oil and a filter.
And for {$Deity} sake please do NOT say her name three times or she'll reappear (ala "Beetlejuice"). She was a harpy that insisted that all the engines were defective, even though the vast majority of cars with sludge ruined engines were shown to have never had an oil change since the original sale.
(There are always a few that have strange stuff happen like coolant gets into the oil, and that sludges the oil and wrecks the bottom end. But it's rare.)
Many of those burned by a sludged engine were the second owners of the car - they bought the cars from the dealer off-lease or as "Certified Used", and the first owner or lessee of the car never did any maintenance that the dealer mechanics could ever find.
Facts: If you leave the factory fill motor oil in an engine for
60,000 miles, it turns to pudding. Pudding does not lubricate. Engines need good lubrication, or they die quickly.
This is why many upscale leases now include the maintenance as part of the leasing deal - it's already paid for, so the lessee has no excuse for not bringing the car in for oil changes. The seller gets the car back off lease in decent resale condition, and they can document all the maintenance was done.
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