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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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What is this discussion about? Toyota Prius, Oil, Hatchback, Sedan

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#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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