I run Pennzoil Synthetic 10W30 year round. Now, cost isn't really a factor to me, since I can let the company absorb the cost of the oil and filter, and do the labor myself or let one of my guys do it for me for brownie points. I will tell you though, when I got it the previous owner hadn't...
I had this same problem on my navigator once. I just bought one new COP and 8 new plugs, and one at a time replaced the plugs with the new COP until I found the guilty party.
Total cost
COP from autozone $47
8 Doube platinum plugs -$32
My time screaming, yelling, and cussing, $priceless$
Andrew
The light shouldn't flash. WHen its flashing, there is an issue in need of repair/fixing. Anytime you catch a flashing light on the dash, or 99% of the time their is a problem that needs remedying.
(thats why alot of the time nowadays they are referred to as dummy lights)
When...
I hate to say things contray to others, but the ford 5.4 to me is one of the most prone to start up noise that ford has ever made. I run an oil change facility, and after changing the oil an F-150, Expedition or Navigator soounds like its about to toss a rod for a few seconds. Now, I know that...
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