Shep69 149 Report post Posted September 7, 2018 Just wanting to know if the Felpro PTFE (Teflon) rear main seals are the way to go or should I just stick with the standard rubber style. Quote Share this post Link to post Share on other sites
GypsyR 34 Report post Posted September 13, 2018 I've become sold on the teflon versions. Any engine I've had a chance to look at some time after installing one has been bone dry. Only a couple I've seen but one was a driver for a couple of years and that one alone was about enough to sell me on the things.Teflon rear seals seem to be mandatory on later diesel pickup engines for some reason. For whatever that's worth. 1 Shep69 reacted to this Quote Share this post Link to post Share on other sites
