Slantsix64
Well-Known Member
Any of you guys notice an improvement in mileage switching to thinner synthetic oil in the rear axle? I'm currently running straight 140w 8 3/4
Ok so why does synthetic oil leak and conventional oil doesn’tAhhh! Confusions say, “use synthetic in old jalopy and find many a leak.”
80w90 is perfectly fine. Every time I’ve tried synthetic oils in older cars I’ve found every leak magically. Lol!
Any of you guys notice an improvement in mileage switching to thinner synthetic oil in the rear axle? I'm currently running straight 140w 8 3/4
Any of you guys notice an improvement in mileage switching to thinner synthetic oil in the rear axle? I'm currently running straight 140w 8 3/4
SPELLING ! CONFUSION AND CONFUSCOUS / CONFUSIOUS ?? LOLAhhh! Confusions say, “use synthetic in old jalopy and find many a leak.”
^^^^^^^
80w90 is perfectly fine. Every time I’ve tried synthetic oils in older cars I’ve found every leak magically. Lol!
SPELLING ! CONFUSION AND CONFUSCOUS / CONFUSIOUS ?? LOL
Bob, I did not write the fortune cookie- I’m only repeating what I read at the restaurant.
Last time I go to “Billy Chin’s Chinese food and leather belt emporium.”
Lol! - damn spell check!
Bob, I did not write the fortune cookie-
Last time I go to “Billy Chin’s Chinese food and leather belt emporium.”
That's all I had laying aroundWhy would you run 140? Doesn't the manual say 80w90?
How many miles does it take for it to reach operating temp?Years back when (ford) switched to synthetic gear lube there were failures. Many failures. Burned up clutches if owner was lucky enough to get it fixed under warranty. Repaired then refilled with conventional oil and friction modifier.
I never considered running synthetic gear oil in my old rigs.
Their job is hard enough, and a lighter lubricant isnt going to help.
I would say 140 would cause higher fuel consumption until oil reaches operating temperature.
Like any heavy oil.
-40 up here, used to run the power wagon in 4 low for a ways before trying to hit the highway.
That ol truck didnt take kindly to
Cold weather.
I mean it's just a question, squeeze a bottle with thick oil see how much force you have to use to get it out then do the same with thin oil and see how easy it is. My usual driving trips are 10-15 miles around town.Wow. This question is right up there with does a waxed car get better mileage also? Good luck on your quest for a answer.
That's all I had laying around
Just kidding , used to know a guy in the A.FORCE that had a million "confuscious" jokes, the guy was a riot !
A/j the motor is 9:5 compression 3.55 gears 904 shift kit roller camshaft. I'm currently getting 13-14 around town with the 318 in the barracuda I know I can squeeze an extra mile in. I'm at 30 degrees total 18 in the dizzy and 12 initial if I bump up the initial I can hear spark knocking at idle I blame my cheap Ecu box hopefully upgrading to an msd box will allow to run more adnavce with no spark knock.i was als thinking of changing to 3.91s since. Do not do any highway drivingnever have I used 140 back there; only 75/90 dyno. In my A833 I use 50/50 ATF and 75/90. If you have a slanty then you can use 100% ATF. I only put the EP oil in there to keep my cluster-pin happy with 430 hp.
With an auto, well you have only one choice; but you can put a shift kit in there to reduce your shift-overlap, cuz in your case I am imagining a lotta lotta shifting going on.
10 to 15 mile trips around town means there is no way to make any kind of fuel economy. Especially with a low-compression engine. All you can do is optimize the timing and hope for the best. Around town, I can almost guarantee you will get better mileage with more gear, more than the 2.73s that are often in these old A-bodies. Lord help you if you have 2.45s; those are strictly for hiway cars and 318s!
I would try 3.23s at least. This will make it easier for the engine to get up into the efficiency zone, using less throttle. And the gears following, keep it there. Not until you hit hiway speed will the economy start dropping. And there is an easy cure for that, just slow down. Also, you can optimize the timing for cruise by yanking out the Vcan, making sure it actually still works, and then mod it to bring in a lot more than the feeble 9 or 11 degrees they are often born with; 22 degrees is possible. I think TrailBeast got 24 out of his.
With slantys don't mod the can straight to 24 with numerically low gears; there is a good chance the slanty with 10* initial will detonate at Part Throttle if it sees too much Vcan timing. Take it slow