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That clears some things up for me, thank you

That's pretty interesting. I guess it makes sense that they are more similar to older oil formulations with the high phosphorus and zinc...

I'll check it out. I've been looking around at a lot of the 5w40 euro oils recently. Don't understand the why the add packs are different from the regular synthetics in the way they are.

Thanks for the references. I've browsed one or two, just looking for more info. I'll make sure the read the others.

What are the advantages and disadvantages of euro oils over the normal full synthetics we typically see here is the U.S.? Like you choose valvoline euro synthetic over the valvoline advanced synthetic... I notice euro oils tend to be high calcium, have good doses of zinc and phosphorus...

So I emailed Redline and they was able to get a response after a few days. They recommended 40-50k miles for a drain interval. I have some of the d4 so I will use this for my fluid change coming up and will likely run it for 30k like usual, though I am comfortable knowing that it is capable of...

I am not a long interval person for any fluids, though I would like to know what intervals they should be capable of. I think it's obvious that changing a fluid early isn't going to hurt, it could only help by not taking a chance of running it longer than it should have been l.

It's a mid 2000's subaru with a 4eat. And I agree that the claim by amsoil is vague and sweeping. Though the owners manual for the vehicle is also rather vague. It just says to inspect the atf every 30k miles, so I've chosen to replace it at that interval. I would also consider "severe service"...

The owner's manual only says to inspect the fluid ever 30k miles. I have been replacing it every 30k miles.

I know both of these atf's are well regarded. I would like to know your opinions and experiences with them, but also what drain interval should be used with each one. I am using it in a vehicle requiring dexron 3 and would probably prefer the one I can run the longest, unless there's evidence...

Thanks for the replies. What I gather from you guys is that any of the oil weights mentioned should be just fine. I'll watch for anyone else's opinions, but for now I think I'll probably just keep using the oils I have been.

I agree, it's not usually very severe. Though I have gone and done things that were a bit severe for the vehicle. I can't monitor the oil temp, but I have had the transmission over temp light come on before

Also it's na, no turbo

So its a 2003 Subaru Forester. It is a daily driver for now and sees some overlanding/offroading on weekends and occasionally week-long trips in the backwoods

The owners manual for my vehicle lists multiple viscosity options, but 2 of the 3 are 30 weight oils. The other 1 is a 40 weight oil for higher temperatures. My question is does it make sense to use a 40 weight oil when it's hot, because when at operating temp it shouldn't require a thinner or...