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Mobil 1 and Slick 50?

18 messages,  Last post on Apr 10, 2009 at 10:50 AM

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#13 of 18 Re: Lighter oils [pathstar1] by acdii Apr 08, 2007 (12:11 pm)
Replying to: pathstar1 (Apr 08, 2007 8:01 am) In your case, no, carbon build up is not an issue, the carbon issue is on older engines, especially pre fuel-injected engines. In your case though I bet it was a number of factors that showed your increased fuel economy, the first being you hit the magic mark where all the parts are working in harmony. The second being the better lubricity of the Mobil 1. Your tires may have also hit their mark where the wear patterns on them give them the least rolling resistance. Some happen right away, others take some time to wear in.
#14 of 18 Re: 05 Ford T-bird syn Oil and conv. top care [thundrjet] by 3screwsloose Apr 08, 2007 (8:15 pm)
Replying to: thundrjet (Mar 15, 2007 6:10 am) Mobil 1 0w-20 is what I use in my Ford. They want 5w-20, and this is an official substitute. Have been using Mobil 1 since '86 - no problemo. Never fold a wet soft top, don't leave it out in the intense sun ( Texas ), and do not use unapproved cleaners/detergents. Ford has a list of approved products.
#15 of 18 Re: Lighter oils [pathstar1] by chadx Nov 19, 2007 (11:39 am)
Replying to: pathstar1 (Apr 08, 2007 8:01 am) Just a clarifying note...you are talking about two oils of the same operating weight. 30 weight. The fact that one is a 5w and the other a 10w contributes nothing to their breakdown (at least not in the length of time oils are normally used in an engine). All engines can only benefit from using the lowest winter weight available. Meaning the first number in the name. 0w-30, 5w-30, and 10w30 in a good synthetic oil like mobil 1 all perform the same at operating temperature (like a 30 weight). The first number is how it acts when at room temperature. And then, the lower the number the better because it will flow through your engine faster on startup (in both hot and cold weather).   A 5w-30 (vs. 10w-30) oil will not make an engine have knocks or other oil starvation sounds on startup. Just the opposite. You are more likely to hear that from the heavier oils because your oil pump can't pump the thicker oil as easily to your engine components. Use a good synethetic oil of the lightest weight your vehicles owners manual recommends. That is usually a 0w or 5w. I don't know of any modern engines that recommend a 10w although they can be run in hot weather. It's just not nice for your poor engine to have to try and pump that 10w on a 32 degree day. Do your Pathfinder and change to 5w-30 (or even 0w-30) in your preferred synthetic. Easier on the engine that 10w-30, even in hot weather, but especially in anything less than 50 degrees.   On a note unrelated to viscosity or weight. another reason synthetic is better because it leaves a film on internal parts, after shut-down, longer than conventional oils, so it is easier on an engine at startup (which is when, arguably, all engine wear occurs).   Though some drivinge mileage increase may be apparent in certain engines, most of the mileage gains are from the time of first startup and then the miles put on until the engine warms up. This is also why, in many vehicles, the mileage improvements, when using a synthetic vs. conventional oil, are higher or more noticable in the winter time. Of course the biggest mileage killer in the winter time is people idling their cars for 15 minutes before they leave. Park your car in your garage (rather than having it full of junk) and think how much gas the country would save every winter day! hehe. Replies to this message: pathstar1 (Nov 19, 2007 12:49 pm)
#16 of 18 Re: Lighter oils [chadx] by pathstar1 Nov 19, 2007 (12:49 pm)
Replying to: chadx (Nov 19, 2007 11:39 am) Actually, you are correct in theory, but in practice, with non-synthetic oils, breakdown of the oil film did occur with 5W30 in the Pathfinder and a previous Landcruiser. Once I switched to 10W30 -standard- oil (non-synthetic) film breakdown did not occur. This film breakdown never occurred at startup, only when the engine was hot and idling. A rough rumbling/grinding sound that would start after a few seconds of idling.   I currently use 5W30 in my Prius and don't see any evidence of breakdown, but I'm using Mobil 1.
#17 of 18 Update to my previous post. by acdii Feb 12, 2009 (9:18 am)
I stand corrected, Mobil 1 does increase fuel economy. When I posted that I had a Prius, I have since traded to a Hyundai Veracruz with the V6. The first oil change I used Mobil 1 and did see a 20% increase in fuel economy. I Also now have a 2009 Camry Hybrid and Mobil 1 did not show any improvement in economy. Even so, the peace of mind from using Synthetics over regular dino is worth it. Longer times between oil changes, means less waste oil, better protection for your engine, and better fuel economy for larger engines.   BTW did you know that part of the oil used to make Synthetic oils comes from rendered animals?   "Mobil 1 0w-20 is what I use in my Ford. They want 5w-20, and this is an official substitute."   Just so you know, the Ford motorcraft 5-w20 is a synthetic blend, it is part dino, part synthetic. Using a 0-20 over 5-20 gives better protection in cold weather starts and meets the manufacturers warranty requirements and CARB. If you use 10w-40 Mobil 1, you are still protected, but will not meet CARB, and your cold protection is not as good. THe higher the numbers, the thicker the base oil. The thicker the oil, the more effort to get it where it needs to go, and the harder the engine works due to fluid dynamics. The thicker fluid offers resistance as opposed to friction, it still protects well, but requires effort to get past that resistance.   The reason slick 50 had to pull teflon out is due to two things, one is when burned, and it does get burned, it pollutes something fierce, and second, it tends to expand when heated and has been known to clog oil filters.
#18 of 18 Re: Mobil 1 and Slick 50? [green55] by whitey9 Apr 10, 2009 (10:50 am)
Replying to: green55 (Mar 10, 2007 10:21 pm) Go ahead with the Mobil 1. Save your money and delete the Slick 50. Change oil AND filter at 5K mi. Drain while at operating temp ( the engine that is ).

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