Originally Posted By: JHZR2
My S-10 sits for long periods. At different times I had tried OCODs and Supertech filters for various reasons, on top of the AC Delco PF-52 and UPF-52. More recently the Fram Ultra.
OCOD and Supertech always caused a startup knock. The delco filters and the Ultra never have, even if sitting for months.
Not sure if there is a delco filter that fits, and they have changed substantially since I bought my stash, so I second the ultra.
WIX performs well with no knocks on the S-10.
What is OCOD?