Installing new chain tensioners in a 2000 S. 996-105-188-01 doesn't want to go in like the other 2. Pumped up all 3 in hot clean oil prior to install. This one for the 4-6 head is different from original, it has 2 extra smaller holes in the middle. It was much harder to pump up with oil than the other 2 or the original one.
Suggestions?