Originally Posted By: stower17
Originally Posted By: TFB1
I figured Ford was wrong back in '08 when I bought my Grand Marquis(yes I realize we're talking HD trucks), been using 5w30 since first oil change I performed at around 18K mi...
Oh yeah there was a bunch of flappin' here on BITOG when I mentioned that, every one was throwing that tight tolerance malarkey in my face... Took probably four years for the book readers to finally realize it's all a CAFE requirement(well at least most of them, some still haven't figured it out)...
Really?.... You drive a grand marquis,that has proved its weight in gold how durable it is, with cab operations everywhere running them 300,000 miles before selling them in running condition, and law enforcement agencies that beat the snot out of them before they sell them in running condition at around 100,000 miles? All while running 5w-20, and you want to argue the 20wt vs 30wt? Im sure some operations used 5w30 but 20wt is what most of them used.
I spent an hour today reviewing oil change threads on the CrownVic forums. From what I saw the majority of them are using 5w30 motor oil. One member who had knowledge of a large cab operation for an airport (100's of cars) indicated that they did 5w-20 oil changes for the first 100K, then 5w30 for the next 200K, and then an even thicker grade for beyond 300K. I would imagine there are other fleets using 5w30 right from the start. Overall, I'd say it's 50-50 on 5w-20 vs 5w30. If there's "hysteria," it's only on the part of those screaming that you'll lose your warranty (and your engine) if you go anything other than 5w-20 on the 4.6L. The kicker being that the 1991-2000 years were originally spec'd/designed/built for 5w30. The 4.6L engine bearing specs didn't change any by 2002 when the back-specification was already in place. My 2002 has 5w-20 on the oil fill cap and throughout the owner's manual. It's also true that in other nations, 5w30 or higher grades are spec'd right from the factory. Common sense seems to point to CAFE on the 5w-20 specification, and nothing else.
Owner of five different 4.6L Ford/Mercury/Lincolns from 1986-2016.