TeamSwift

I've tried several oils and am now using Royal purple 5W30 and Synchromax. Never measured a MPG improvement but I feel confident leaving it in there 2-3 times as long.
Several years ago I used ATF in the manual tranny because it was muuuch thinner than the 85W?? that the owners manual called for and other cars I owned used it in their manual boxes. No imprvement in MPG but a couple of bearings in the tranny failed after a few years. Could have been unrelated but I'll never use it again.

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1990 Metro G10 5-speed
Econo cam +8 degrees, Miata 14s
54 MPG

Mobile 1 has advanced fuel economy oil which from what I can see on the shelves comes in 0w20 and 0w30. I don't know what that would translate into cause I always use manufacturer reccomended weights.

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$100 95 Geo Metro Hatch, $150 91 Geo Metro Hatch, $300 90 Geo Metro Wagon, $250 98 Chevy Metro Hatch = Cheapest Fun Ever (All with 1.0's)

Suzuki G1.0, setting the bar for hybrids since 85'

Originally, we'd do the $5 oil changes, but as things got more reliable, we upgraded.
Mobil 1 EP 5w-30 for the win.



$45 an oil change; not for your average engine, but for our non-oil leakers:


(1.0 N/A, 1.0 N/A, 1.0 Turbo, 1.3 DOHC, 1.3 SOHC)
seems to add the extra 'confidence factor' that you have with your current engine oil.
Kudos to the Teamswift member who mentioned it first on this site (think it was the oil geek, gamefoo).

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DIY Broken Bolt Removal: viewtopic.php?f=22&t=41042
DIY Clutch Adjustment: viewtopic.php?f=9&t=48281
DIY Wheel Bearings: viewtopic.php?f=2&t=29003
DIY Shocks: viewtopic.php?f=10&t=45483
DIY Wheel Align: viewtopic.php?f=2&t=42479
Once you get the cars dialed-in (compression, leaks, bearings, alignment, brakes) swap in new rubber and glass, you've got something which should last for years!

You should read the story on Royal Purple. He invented Mobil 1, it was to be sold for 8 bucks a quart. Mobile said they could not sell oil that high when it came out, so "change it". To which he said, Why? It is the best in the world. To which they said we cant sell oil for 8 bucks a quart when oil is only 99 cents a quart now. Even as synthetic we can only sell it for 4x the price...so 4 bucks. Your formula is too costly.

So he re did the formula, which became Mobile 1. Then quite and started Royal Purple, using the same formula Mobile did not patent.

....also in every case I have replaced said oil with RP, it have seen mileage gain.