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If transmission fluid not changed regular drain old fluid and use some again with fresh not joking.

For cars that have not kept up with service a tranny fluid change can cause big problems and flushes are cause of big problems most garages flush as add on for profit. Google Scotty Kilmer’s video on YouTube. The adaption reset is key in don’t start engine foot down on accelerator for twenty...

StealerShip

Avoid manol oil

BEWARE ...!!!!!!! MANOL MAY NOT COMPLY WITH LABELLED SPEC see below

https://www.northamericanmotoring.com/forums/jcw-garage/328276-synthetic-motor-oils-testing-results.html

Amsoil always way exceeds api standards more than shell and Castrol in some areas

Lots made by big brand read the data safety sheet it discloses manufacturer although formula is diff to there own

VLS is a good site they investigate oil manufactures when someone complains here’s an example http://ukla-vls.org.uk/wp-content/uploads/6.13-VLS-010154-publication-as-at-26-11-2020.pdf

Even sponsors like petronas have to meet or exceed the mb spec otherwise they can’t be mb approved or on the mb spec sheet

Zinc Dialkyl Dithiophosphates or ZDDP is the zinc. It’s in in Valvoline vr1, et al. Good for engine wear and great for racing. There’s very low content in cheap oil also environmentalists moan about metals and the environmental damage..!

There are many that exceed five diff categories according to API in USA To meet group five they will be the best synths. Like I said there are categories and since the 1920s there have developed from mineral to super complex synthetic tech a

GLYSANTIN® G48® By basf or MB brand made by Basf or Comma with GLYSANTIN ————coolants———-

Wear factor shearing and zincs

Not all synthetics are created equally. Base and additives not as good as castrol edge. Is it on the mb Sheet approved.