White smoke
2nd Gear Member
Joined: May 2012
Posts: 482
From: NY
After reading posts by Ford engineers I verified the following with Scott Hoag (Ford Bullitt and Mach 1 Program Manager - now owner of MRT): 5w-20 was specified for our Mach 1s and other Fords purely for CAFE (Corporate Average Fuel Economy) numbers. The 20 weight oil lets Ford eek out a couple of extra 10ths MPG in government testing. 5w-30 is the preferred weight.
If I recall correctly, the change came in 2003. Before that date, 5w-30 was spec'd for DOHC 32V 4.6 engines. Ignoring CAFE, you should use 5w-30 in your Mach 1 engine. 5w-20 certainly won't hurt it in winter temps and you probably won't be going on long 80MPH trips in February.
If I recall correctly, the change came in 2003. Before that date, 5w-30 was spec'd for DOHC 32V 4.6 engines. Ignoring CAFE, you should use 5w-30 in your Mach 1 engine. 5w-20 certainly won't hurt it in winter temps and you probably won't be going on long 80MPH trips in February.
Joined: Apr 2013
Posts: 20
From: Southern California
White smoke can be valve seals as well it's not just coolant. If your car is consuming more oil then usual then it's time for a compression test & a leak down right after. Pretty much if you find odd number(s) which I hope you don't, then those should be the cylinder(s) to run the leak down test. A retired Ford technician told me it's normal for our engines to burn 0.5-1 quart every 1,500-2,000 miles. It's notorious having smoke come out the exhaust during cold start, but it's not normal during driving. I hope this helps.
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