I care more about grade and spec than brand. I'd rather run older engines on 10/50 which really narrows it down. I'm not a cheapskate but ditching £130 worth of millers every spring even if the car has done a thousand miles gets a bit annoying, although it's still all I've used for years.
I'll be letting my Indy chuck some of his stuff in for this year as I won't get to use car much. Next spring it will get 10/50 millers again. The only reason I pay that price is that there isn't a similar 10-50 for less money.
I don't believe for one minute though that anyone can feel or prove that millers is better from an owners perspective. By that I mean without lab testing etc.
If your engine runs great and hasn't gone bang maybe it would have with other oil in too.
Likewise if an engine goes bang with other stuff in, prove it wouldn't have if it was on millers.
I almost bought 2 lots of this the other week. Very similar specs to millers 10/50 but when speaking to company they said they could not say it was or wasn't suitable as it's primary use is in Motorsport.
It's API SJ which is an oldish spec but perfectly age related to mk1 996s being from around 1999.
https://www.ebay.co.uk/itm/381965690806
API SH or SJ is ideal apparently, some newer specs have less of the old type additives for certain materials in our engines.
https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1807445
Anyway I decided why take a risk with an unknown to save £60 but I do begrudge paying £130 for oil. Clever marketing and regularly plugged by Hartech though.
I'd love to hear from anyone who's found a correct spec 10/50 that isn't millers. Not bothered about Porsche approved, just correct spec. :thumb: