Best high mileage motor oil.
#2
In my 02 screw w/ the 5.4 I run Valvoline Maxx Life synthetic blend 5w-20 ever since my truck hit 75xxx miles. I have had my truck since it had 10xxx miles{got it for a song was a local lease turn in}. Before 75k I used Valvoline synthetic blend. I would stay away from Pennzoil{JUNK OIL FAIL For ex. my G-pa used it in his 76 Grand prix-when he went to have the heads done after blowing a head gasket there was WAX on top of the pistons}I would stay away from Quaker State also as they and Pennzoil are the same co. Kendall,Mobil-1,Havoline,Shell are all good oils. Good luck
#3
Well i have a Inline 6 with the exact same mileage and i use the valvoline
10w30 conventional oil and after 3-4000 miles it still has a nice brown color to it. If you want the best synthtic oil look at Valvoline Synthetic or Mobil One Extended Performance. And X2 Stay away from pennsoil I dont think it would be a good idea to throw synthetic in a 240 thousand mile engine if it has never had it.
10w30 conventional oil and after 3-4000 miles it still has a nice brown color to it. If you want the best synthtic oil look at Valvoline Synthetic or Mobil One Extended Performance. And X2 Stay away from pennsoil I dont think it would be a good idea to throw synthetic in a 240 thousand mile engine if it has never had it.
#4
How about none of the above including a high mileage oil. Your 4.9 was designed with lots of ZDDP (zinc/phosphorus) in the formulation. None of the normal OTC oils are going to have much of it as it is suspected of killing the emissions systems should the ad pack gas off- like an engine that isn't driven much and accumulates moisture/condensation. So you'll need to get outside of the box a little for your oil. I'd suggest using Rotella 5w-40 synthetic. There's not really much in the way of it being a high tech synthetic as it's a mostly Gp III base oil. But it does have about 1200ppms of Zinc in the formulation whereas most of the oils today are below 800. It's also got a splash of moly in the mix for when things get really hot.
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