What I feel about oil changes. Is just get it changed at whatever a reasonable interval to you is. Try to make it as easy on yourself as well. I recommend no oil type to others.

Other than staying away from oils like walmart sells under their own in house label in five gallon plastic buckets. Their gallon jugs and quarts may be no better. They are a high margin company and consideration for the customer is not their operational mandate. Whoever supplies that oil does it for a sub standard industry price. To do so indicates it is not even of average quality.

People may be a little too rigid. If a car of ours is used only locally 90 percent of the time on short trips. Say of five miles or less one way.I Get that oil changed more often. If another car as is in our case sees four to six hundred miles a week highway service primarily. It can go a little longer than average. Then there is the claimed six month rule as a guide to changing.

I have never thought about that much or looked for a description of why. At the same time sulpheric acids and perhaps others do accumulate in the base oil of gas engines. Possibly not burning off. Other than it is totally not milage related.

Base oil is far cruder than diesel fuel that does not seem to oxidise in my experience usually. Base oil is also contained in a semi sealed situation. This applies to normal petroleum based dino oil. Synthetics on the other hand seem to use many variations of their base component.

In my case after all these years. I am switching over to vacuum extraction. Making it easier in many cases will just get it attended to quicker usually as well.

I find scrounging what is needed to make a vacuum setup. Or many other things is almost becoming a lost art. Most like myself do it perhaps because when we were very young there was no other reasonable option at the time. In addition I like building things. So it became a developed skill set. Too much general affluence has resulted in this not being as common today as it once was. I really believe all our four children very seldom engage this approach. Or ever really learnt how to go about buying things.

It is strange what time works out like. For some available time presents no issue. In my case as perhaps in many others. If I can do it faster and easier it does not tend to get deffered to when I have more time as often.

I probably would be far less diligent with an obviously already tired engine. I also would use a higher viscosity oil as well to reduce the oil burning in them. Plus hopefully add some additional protection from worn parts coming into physical contact by doing so. People forget that the more wear present the quickening rate of even more occurs.. At this time fortunately I do not own any fairly worn engines.

Do not buy high engine milage oil unless you have leaking seals. Still tight seals do not need it. Technically it could even cause them to leak in some cases.

Use only German labeled brand oil filters for german cars. Simply because they have substantially more filtering medium internally usually. On Japanese cars try to use oem filters.

Companies like Toyota do not have specific demands on using their oil. They do have demands on using their oil filters though. Especially during the warranty period. Aftermarket filters are known to come apart and destroy their engines.

They are cartridge insert types and possibly break up and block the output port of the filter housing. Or more likely engine oil passages. Under warranty if they open the filter cartridge holder up..Finding the aftermarket filter cartridge has probably done this. No replacement engine will be supplied.

After warranty the engine lost can and will be on you. You can usually source good oem oil filters in small bulk orders just as cheap as some of the aftermarket ones. Sometimes even cheaper. There also has been a shift in aftermarket item pricing. Many times today you can get the part from dealers cheaper. For example I think our Toyota oil filters are about 4.00 dealer sourced up here in Canada. Probably 5-7 dollars at the auto part chain places for an aftermarket one.

I left this post and checked. At the largest auto parts chain operation in Canada. The oil filters start at 6.95. Go all the way up to an insane 18.00 for the gold plated version for the same car. Obviously servicing the people who think they are somehow getting more because It costs more.

Marketing hype still works in general I suppose. Many things contribute to keeping the economy afloat.

Trying to find examples of these older cars in better condition overall. Even if a little more costly initially. To me common sense indicates. Their base engine oils just may have been changed more frequently. I really dislike the expression of win win. At the same time this could easily apply to them.