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Out of warranty, the Amsoil AMO 10W40 would be great in your Florida summers. I would then run the Amsoil 0W30 for winter. If you want one year round oil, the Amsoil DEO is 5W40 and loaded with zinc. STi's love zinc. That's why they hate Mobil 1. ;-)

Thank you for the suggestions folks! Does anyone know that the specification differences are for 505.01 versus a CI4+? My guess is lower Zinc / Phosphorous like SM compared to SL, but I don't want to guess on this.

My search here was unproductive due to the number of "Volkswagen" and "Amsoil" hits you get. Amsoil recommends their AFL 5W40 European Car Formula for both applications, and I'm waiting to hear back from their tech line why they don't list HDD, DEO, or any other alternatives. Does anyone...

Although the Wix 51356 has more filtering area, I'd hesitate to switch to it since it is not the OE size, and our Subaru's are known for spun bearings. Don't give them excuses. If you want to be serviced by the dealer for warranty maintenance, buy any decent GF4 synthetic and bring it in to...

Originally Posted By: Ben99GT Originally Posted By: Audi Junkie Funny how none of those numbers really jive with these: http://www.pqiamerica.com/testresults3a.html Well, my first observation is that the Amsoil viscosity listed is 10W30, and your link compares 5W30 oils. My guess is that...

Originally Posted By: Rohan I'm trying to see which oil should I go for next time? If I used purple then after that where did purple go n same thing for pink=Amsoil? For now I'm using 10w30 PP 5k or 5 month inteval n my engine (VQ35DE) got 9,000 miles on it now. pink = Amsoil? The racing oils...

Originally Posted By: NHHEMI Amsoil XL( their only API oil line ) Why do I keep reading that here on BITOG that XL is Amsoil's only API certified oil line? Is there a different term for "API oil line" used here that I don't understand? The Dominator Racing oils are their only "passenger car"...

I have both the blue-handled style channel lock pliers for when there's lots of room around the filter. These are commonly available at most automotive hardware stores. The Amsoil small filter (Lisle style shown above) filter remover for when access is tight around a filter. (e.g.: Subarus with...

Originally Posted By: CruzinA1A can any damage be caused by sligtly overfilling a transmission? what would any symptoms be? Our 2003 Acura TL 5 speed gets harsher shifts, especially to second, when trans oil is above te top marker. I don't think that it causes damage because it returned to...

Wow, 2.9 TBN and they're encouraging an extra 1700 miles? What does this Motorcraft start at?

Originally Posted By: Colorado_S14 Between the three Amsoil choices I listed are there any opinions? Don't use the XL on the track. That motor deserves the best. XL is technically Group III and has higher volatility than the full PAO Amsoils. Don't use AFL European formula. It has lower ZDDP...

Originally Posted By: steve20 agreed on the RWHP--doubtful. While it is absolutely possible to build , in this form, it is not going to live too long no matter what The first line of the OP mentions aftermarket turbo...? Don't worry about how he's going to get there. It would help to know oil...

It seems to be more advantageous in a car designed for 5W20, but yes. 10% is not unheard of. Remember that Castrol 0W30 is at the high end of the 30 scale (12.1 cSt), Edge 5W30 is kind of low (9.8 cSt.)

I have two Subarus, and the upgrade to 5W40 synthetic sounds like a good plan to deal with the extra load. Rotella T 5W40, Mobil 1 0W40, Amsoil DEO 5W40, RP 5W40 are all good choices. Get what you can with the lowest cost of ownership.

Originally Posted By: Zedhed They're stimulating the economy at the least. I like this polite phrasing. "Hon, I'm not wasting money on the race car. I'm stimulating the economy!!!"

Originally Posted By: addyguy Moving from a 50wt. to a thin 30wt. WILL 'free up' some HP, as it will reduce parasitic losses due to drag. Will not increase amount of HP engine has. Yes, this is what I meant. Using an oil with 10cSt viscosity instead of 17.4cSt @ 100C. When you call up Royal...

Originally Posted By: Gary Allan Most driving events are 20 minutes or less. The use of a 20 weight reduces the parasitic losses during that time. The bigger the difference in visc, and the shorter the duration of the event, the more pronounced the difference in parasitic losses. 20 weights...

Motul Gear 300, Amsoil Severe Gear, and some other dedicated ultimate protection gear oils are not friction modified for working with synchros. It becomes most obvious in Subaru six speeds in cold weather, trying to grab 1st when you start out in the morning. If your STi is rolling down the...

The Redlines are also good for extended drain intervals, if that helps with your cost justification. And we just Redline MT-90 as an "additive" to blend with high quality 75W90 synthetic gear oils (Motul Gear 300, Amsoil Severe Gear) in manual transmissions. About 25% MT90 slows the synchros...

There's some Honda guys here running Amsoil diesel oils, in order to get the Class IV PAO high ZDDP packages in the typical fuel economy grades. If you're pounding on it at the track in the high RPM's, the HDD 5W30 is near the upper level of a 30. SL Gasoline grade. Something to add to the pot.