Nah you should be more than good. Might have em take a peek at the spark plugs but other than that it should be all good. 99% sure you don't have any sludge unless the previous owner truly neglected it.

If it'll make you feel better toss this in immediately prior to oil change. Might not have much of an effect but Liqui Moly makes some good stuff between that, hydraulic lifter additive, and anti-friction additive.

Other than that rav4s are stupid reliable. I have an 03 with 205k on the clock and it still runs like a top.

u/mr-cafe · 2 points r/BMW

Depends. But this would be the easiest thing to do.

Some people hate it, some use it (I haven't) - there us a thing called engine flush to clean the oil system. You pour it in the old oil, led it run for a few minutes and change the oil then. Can get rid of sludge, some people vlsim it can damage the engines seals. https://www.amazon.com/Liqui-Moly-2037-Pro-Line-Engine/dp/B00CR3RXTO

You then take good Bmw ll98 or ll01 oil and see how it runs.

Something like this:

https://mobiloil.com/en/motor-oils/mobil-super/mobil-super-synthetic-euro#5W-40

u/Sega_kid · 1 point r/cars

Damnit, I just went to their website to confirm and got confused which it was now - it’s been 2 years. It was definitely an engine flush product, but looking at their Australian website, none of the containers there look quite the same as the one I had - they’re all silver, the one I used was black.

EDIT: I gave up with their website, but I think I found it on amazon. 90% sure it was this one
https://www.amazon.com/Liqui-Moly-2037-Pro-Line-Engine/dp/B00CR3RXTO

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