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I have been using T5 in my Jeep 4.0 and my Cadillac 4.1. Both cars have flat tappet lifters and my Cadillac manual says DO NOT USE 40-weight (in big bold caps) so I wanted to try the T5 as a 30-weight. Both cars run noticeably better, ie better compression, better mileage, less noise and...

My XJ 4.0 runs best with Rotella T5 10w30 (sold by the gallon at wally world). It doesn't make any noises and it doesn't consume any oil.

A higher cap (eg 16 instead of 13) is probably the technically correct preference. I don't think it matters that much though. This page says water boils at 206f @ 13 psi and 216f @ 16 psi, so if you have a 195 thermostat then you can expect normal operating temperatures of 190-220f and the...

Following up... the clunking noise pretty much disappeared entirely after about a month. I just hit the 1k mile marker after the additive treatment and took it to a tranny shop for another drain. The mechanic said the pan and old filter looked clean. I had them install the last of the Pennzoil...

Originally Posted By: PT1 Originally Posted By: JHZR2 . Generally on ATs with over 100k and unknown history, fluid chsnge shoul dbe very gradual, with many changes. JMH I agree...fluid exchanges are good...gradual ones even better if you have over 100k..but that's JMHO That's what I did on...

I just did another ~50 mile drive and it is better again. Even reverse has changed to more of a thud than a thunk. At this point I'm guessing the tranny is just dirty and the low-pressure valve noise is clearing itself up. I'll keep the current mix going until my next oil change in 1.8k miles...

Originally Posted By: Pablo When was the fluid last fully changed? filter and fluids were previously changed at 96881 miles in 1998

I have it for my 85 Cadillac and 91 Jeep Cherokee. I also have the printed FSMs as well as the Haynes and Chiltons books. It's good for supplemental information that is not in the FSMs, TSBs, replacement parts info (module X replaced by module Xa, for example), and other such info. Frankly the...

My '85 Cadillac gets 29 highway at 67 mph, and it's shaped like a shoebox

I have owned the car since the 90s and have maintained it pretty well. The last fluid came out clean according to the tech. I didn't see it, but they do all my suspension work and have no reason to lie about color. It's always been red on the stick btw. I don't know if they put the filter in...

Hi guys, I've got a 1985 Cadillac DeVille with 139k miles that is in solid condition so I've been trying to do a full service to get it ready for the next 20 years. It's got the old-school 440-T4/4T60 tranny, and I recently had Midas drain (not flush) the old Dexron III, and swap in a Wix...