Best Oil for High Mileage
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Best Oil for High Mileage
Like I said before I bought an 99 F150 4.2 with High Miles (200.000) and I don't known what kinf of oil the previous onwer used on it,I pretend to use Mobil 5000 conventional 10w30 or Mobil High Mileage 10w30 btw I live at Pennsylvania and the winter is coming,what you guys think about use those oil with 10w30 viscosity? thanks
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But i'm afraid to use 5w20 on High Mileage I heard that we have to use heavy oil...I'm just confused
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These aren't the old engines your dad worked on these newer engines have tight tolerances even when they get old.
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Unless my brain went on vacation without me, that truck was speced for 5w-30 in 1999. I wouldn't use anything less. The issue is that all new engines break in to the viscosity of the oil used. Use a xw-20 oil and the crank will wear to where the oil film for a 20 oil is providing lubrication. Use a 5w-30 and it requires a little more "space or wear" for the thicker oil film to provide lubrication. Use a 15-40 and it gets bigger. But the crank is the key to any lubrication in a pushrod engine as it supplies the oil to the ring packs. Have an engine with miles on it that is accustomed to a 15w-40 oil and put a Xw-20 in it and the rings are going to starve for oil as the thinner oil will run out of the crank bearings instead of being pumped to the rings. I'd start at a 5w-30 Pennzoil High Mileage oil. It has a cleaning detergent that with use will clean up any junk from the previous user, if any. At 200,000 miles, your engine could benefit from a high mileage oil. You might even have to move to a 15w-40 oil if the oil pressure at running temp is low. In that case, Delo 400 is the oil for you.
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From: South Central Kansas
5w20 Motorcraft Synthetic Blend, I believe it is listed on the oil fill cap, 15w40 is for diesels. Ford designed and built the 4.2 and they know what is best for it. Also use a quality oil filter, Motorcraft.
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Fer Ol' 'Nerd's rationale on Delo 400, refer to this:
Russo, sorry I didn't get back to this thread. The Rotella named oils are known as dual rated oils. They are rated for diesel and gas engines, not diesel alone. You'll find the base oils to be a lot more robust than any conventional oil rated at SL or SM which makes them ideal for your application. If you're uncomfortable in using the 5w-40 oil, there is also a straight 30 oil in Rotella. I would not suggest using any conventional 10w-40 oil. The difference is the base materials used in getting the viscosity spread. The 10w-40 will be loaded with polymers- the same crap that makes for a lot of sludge. The 5w-40 makes the spread via Viscosity Index and requires very little VIIs in the formulation.
You also find Chevron Delo 400 and Mobil Delvac to be dual rated oils so if you have preference, pick one. But most of the high performance guys are using Rotella due to the ZDDP (zinc) content in the formulation. While rated as an API SM oil, it exceeds the limits set by API for the SM rating. It tops the limits for SL as well. FWIW, your engine requirements when new as SG rated oils which had almost twice the ZDDP as the current SM oils. ZDDP is an anti-oxidant, friction modifier, anti-wear, extreme pressure, and metal deactivating agent. For the most part, it became popular in the 1950's as a cure all for engine wear. Engines from those days only lasted about 50,000 miles, some of the wear due in part by the leaded gas of the day. As we grew in technology to unleaded fuels, engine life has increased. But the older engines designed to use this agent in the oil formulation will suffer accelerated wear usually at the cam and lifters. Solid and flat tappet lifters are gone as a result- rollers are in. This an extremely abbreviated version of why I recommended the Rotella. I hope it helps you determine what is best for your truck.
You also find Chevron Delo 400 and Mobil Delvac to be dual rated oils so if you have preference, pick one. But most of the high performance guys are using Rotella due to the ZDDP (zinc) content in the formulation. While rated as an API SM oil, it exceeds the limits set by API for the SM rating. It tops the limits for SL as well. FWIW, your engine requirements when new as SG rated oils which had almost twice the ZDDP as the current SM oils. ZDDP is an anti-oxidant, friction modifier, anti-wear, extreme pressure, and metal deactivating agent. For the most part, it became popular in the 1950's as a cure all for engine wear. Engines from those days only lasted about 50,000 miles, some of the wear due in part by the leaded gas of the day. As we grew in technology to unleaded fuels, engine life has increased. But the older engines designed to use this agent in the oil formulation will suffer accelerated wear usually at the cam and lifters. Solid and flat tappet lifters are gone as a result- rollers are in. This an extremely abbreviated version of why I recommended the Rotella. I hope it helps you determine what is best for your truck.
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There is a Ford TSB stating to run 5w30 in that truck. If you run thicker oil, your cam chain tensioners will not operate properly and the chain will slap the timing cover on startup. ALWAYS use a filter with a silicone anti drain back valve. Do some searching and you will see I'm not making this up or stating an opinion.
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My point remains the same - DO NOT run thicker oil in that engine.