Dear chrisjul,
Good p.m. and may this find you well.
IMQHO (in my quite humble opinion), if an owner has not been diligent about:
(a) changing the oil and
(b) changing the timing belt (even on an non-interference engine, i.e., a B230F/FD/FT, etc.)
it seems likely that said owner has not been diligent about maintenance in general.
Thus, when I learned that the previous owner of my 940 had had the timing belt changed at 54K - and that the servicing dealer could account for almost all of the oil changes - I concluded that no corners had been cut on the maintenance. That has turned out to be so.
I passed on lots of cars, because I could not get definite, factual information on these two aspects of the maintenance.
Adherence to the timing belt interval is, methinks, a good indicator of whether or not an owner is mindful of the need to do - or to get done - the maintenance.
As to your general point: that additives likely aren't needful, I tend to agree with you. Still, I have in my driveway an '85GL with 198K - with which I must sadly part company [rust] - which has always had Techron added, and which still has all of the original fuel system components.
Have a Safe and Enjoyable Memorial Day Weekend.
Yours faithfully,
spook
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