What Weight Oil ? - VW Forum :: Volkswagen Forum
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post #1 of 14 (permalink) Old 11-01-2010, 08:35 PM Thread Starter
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What Weight Oil ?

What weight oil do you guys use? I got my oil changed recently and they put in 5w30 which I don't care for. I have always been a fan of thicker weight oil.
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post #2 of 14 (permalink) Old 11-01-2010, 10:29 PM
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I always used to run 5w 30 conventional oil for the longest time but have recently switched to 5w 40 synthetic. As far as i can tell its sweet, i like to have a 40 weight for my engine as it wears more.
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post #3 of 14 (permalink) Old 11-02-2010, 08:39 AM
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VW's have some latitude on what type of oil to use, ranging from 5W/30 to 20W/50. If you want fuel economy, go with a lighter oil. If you are a performance driver, go with the thicker. Most experts I've encountered say the skinnier the oil, the better. If you are concerned about engine protection, the choice of filter is equally as important. The more pleats in the filter medium (surface area) the better. My filters of choice are NAPA Gold (made by Wix) or Purolator PureOne. There is a also good sticky at the top of this forum that covers the topic of oil.
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post #4 of 14 (permalink) Old 11-02-2010, 05:57 PM
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I have to disagree with the fuel mileage comment, the differences would be so small that it wouldnt even be worth mentioning. I ran 5w-30 then 10w-40 and noticed no difference in fuel economy, just valves were a little quieter. Dont be using 20w-50 oil on a gasser, thats more of a diesel oil

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post #5 of 14 (permalink) Old 11-02-2010, 08:13 PM
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Oil weight should be based on operating temp. 5-40 will cover a wide range of temps from 0 degrees to 85 degrees and should not make the lifters rattle on startup. 20/50 weight oil on a cold day can make an oil fliter leak or burst. Always use a great quality oil filter like a Mann oil filter. Auto Parts at AutohausAZ - OEM Auto Parts - Discount Replacement Parts, Resources and Car Care Tips Using the filter for a 1.8T or A-2 diesel will give you a bit more capacity and filter meadia.
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post #6 of 14 (permalink) Old 11-03-2010, 09:22 AM
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My commentary about fuel economy vs. performance came from the Haynes manual. Nevertheless, I agree that the differences in fuel economy are negligible. 5W/30 has the widest temp range of all the recommended MK3 Jetta oil weights. In my case with a car with 250K+ miles on it, I found that skinnier oil reduces valve rattle on start up. However, I live in the sunny south - US, and Mcrow lives in Canada, so the winter temps are drastically different. Perrib, are you suggesting using a diesel filter on a gasser? Just curious.
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post #7 of 14 (permalink) Old 11-03-2010, 10:12 PM
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Yes like the upgraded 1.8T filter it has more filter media and since it is for the diesel it has a greater bursting strength. Fram found that out the hard way when they used an auto fit filter instead of testing a stock VW diesel filter. Even the Corrado had a larger filter fiitted from the factory along with a better oil pump and oil pressure switches with a lower PSI spec to hide the bearing/pump wear. Most of the own owner MK 2 and 3 engines run in Phoenix with 5-30 needed oil pumps and bearing as early as 60K miles. We had customers with 300,000 to 450,000 miles on the engine that ran straight 30 and 40 weight oil. VW reccomended only straight 40 weight for temps over 85 degrees. In LA you can get away with 5-30 for much of the year. At one time it was reccomended by VW for temps up to 60 degrees. Later when the EPA wanted fuel saving oil VW switched thier reccomendation to fuel saving VW engine ruining lighter weight oils. The MK 4 engines are redesigned to use lighter oil. For the last twenty years I have used two of the Mann Diesel or the massive OEM 2.5 Eurovan filters on my off road VW air cooled engine.
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post #8 of 14 (permalink) Old 11-04-2010, 08:12 AM
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Thanks Peribbo. I didn't mention before that the Haynes manual has an asterisk next to 5W/30 on the spec chart indicating that weight of oil shouldn't be used for higher speed, longer trip situations. I'll look into a 1.8L oil filter. Filter circumference may be an issue because there isn't a lot of room to get the filter in and out between the lower cross beam and the engine block.
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post #9 of 14 (permalink) Old 11-04-2010, 10:14 AM
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the 2L oil filter works sweet for me.
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post #10 of 14 (permalink) Old 11-04-2010, 08:20 PM
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The 1.8T and diesel fit. The filter location is the same on the diesel block as on the gas block. The Eurovan would never fit as it is about 11 inches long.
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post #11 of 14 (permalink) Old 11-04-2010, 08:29 PM
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5w 30... it provides the most protection at cold starts (viscosity 60) and still maintains the correct viscosity when at running temperature (viscosity 10)

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post #12 of 14 (permalink) Old 11-17-2010, 11:14 AM
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Quote:
Originally Posted by JettaSetta View Post
Thanks Peribbo. I didn't mention before that the Haynes manual has an asterisk next to 5W/30 on the spec chart indicating that weight of oil shouldn't be used for higher speed, longer trip situations. I'll look into a 1.8L oil filter. Filter circumference may be an issue because there isn't a lot of room to get the filter in and out between the lower cross beam and the engine block.
Worst case scenario (this is a little messy but workable) if you can get the filter in but not off due to space restriction. Drive a long phillips head through the filter with a hammer and twist that sucker off.
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post #13 of 14 (permalink) Old 11-17-2010, 11:15 AM
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Anyone using Rotella?
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post #14 of 14 (permalink) Old 11-21-2010, 05:43 PM Thread Starter
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Anyone using Rotella?
I use it in my Jeep. Awesome stuff.
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