front axle oil ?
Posting Guru
Joined: Feb 2004
Posts: 2,148
Likes: 6
From: Western New York
Originally Posted by steve604
80w90 is good enough for the rear end too. i believe the only reason ford started the 75w140 thing a few years ago was to get slightly better gas mileage out of it so they could put a better epa mileage rating on the truck when it was new on the lot.
this is also the reason for 5w20 motor oil recomendations in the gas engines which actually causes engine wear but better gas mileage.
this is also the reason for 5w20 motor oil recomendations in the gas engines which actually causes engine wear but better gas mileage.
Posting Guru
Joined: Jul 2006
Posts: 1,720
Likes: 1
IMO 5w20 was used to lower fluid resistance and improve CAFE rating at the expense of engine life. (5w30 or 10w30 will have the opposite effect but your fuel consumption will hardly show on just 1 vehicle)
The internal clearances on the engines haven't changed much. Years ago main bearings would have clearances of .001 to .002 and today they can't get much tighter. However the manufacturing process to control statistical variation has improved so more parts will be exactly the correct size and raw materials have improved. This helps make the engines more consistant and will also reduce oil consumption. However $$ is the driver for Detroit and lower viscosity oils will allow more gas hogs (read suv's) to be produced at higher profit.
The new oils are killers on older engines that dont' have a roller tappet cam. Some of the new oils will destroy a cam and lifters in less than 30,000 miles if they aren't roller tappet. So if you do have an older car make sure you use the older oils. However most new cars do have the roller tappet because this also improves CAFE.
But these are just opinions and your opinion may vary.
The internal clearances on the engines haven't changed much. Years ago main bearings would have clearances of .001 to .002 and today they can't get much tighter. However the manufacturing process to control statistical variation has improved so more parts will be exactly the correct size and raw materials have improved. This helps make the engines more consistant and will also reduce oil consumption. However $$ is the driver for Detroit and lower viscosity oils will allow more gas hogs (read suv's) to be produced at higher profit.
The new oils are killers on older engines that dont' have a roller tappet cam. Some of the new oils will destroy a cam and lifters in less than 30,000 miles if they aren't roller tappet. So if you do have an older car make sure you use the older oils. However most new cars do have the roller tappet because this also improves CAFE.
But these are just opinions and your opinion may vary.
Thread
Thread Starter
Forum
Replies
Last Post
djmichael24951
1987 - 1996 F150 & Larger F-Series Trucks
29
Nov 11, 2015 07:49 AM
Snuggyworm
6.0L Power Stroke Diesel
4
Jul 30, 2014 11:35 PM
