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my 2 cents: I have had good results with both. Use VSOT if you need the increased viscosity, SX if you don't. And I completely agree with Terry, without analysis, your just guessing.

Would Pentosin CHF 7 or CHF 11 be the best for a 99 Passat as a replacement for the darkening stock fluid with 60k miles? Also is it safe to Arx the PS with Pentosin fluid? Thanks

LC flush and now Rotella 5W-40 w/Arx in for the next 1500 miles (plus FP in the tank). The sludge monster is at bay...

Yes it's bigger and doesn't fit. An elderly member of the family was coming home at night after a stressful day and thought it odd that they had to hold the nozzle up against the filler and that there was considerable splashback. After several gallons it registered that it was a Diesel nozzle......

Well I found that the octane of diesel is only about 20! so I think it's siphon as much as possible out and refill with the highest octane available in the area and maybe a shot of octane booster for good measure. Thanks everyone.

Well, I didn't know what forum this belonged in so here goes. A family member just topped of the gas tank with diesel fuel (vehicle is 99 passat 1.8t) Probably about a quarter tank. It still runs but will it be okay? I'm not really worried about the engine but rather things like the O2 sensors...

Another thing to consider is what happens in a crash (hopefully you only think about this!). Modern cars are designed to crumple in a specific way to absorb energy. Adding a good strut bar to stiffen the chassis can alter this and result in higher occupant loads. That said, a well setup chassis...

What can be used for long term (more than a year) storage of diesel fuel?

I heard that might happen with M1 but there is still Delvac 1 (same oil) available at truck stops and avlube.com (although a bit more than T&SUV at Wally World). By the way, on the subject of Amsoil, since these are known potential sludgers, would their AME 15W-40 HDMO diesel oil be a better...

Thanks, OR what about Amsoil's reformulated 5W-40 afl, then I could just have it delivered to the house?

I've searched and read and am starting to narrow this down but a member of the family just bought a 1999 1.8T Passat (50k miles). My thoughts are an Arx cycle followed by T&SUV (hard to find in the area) or 0W-40 Mobil 1 (readily available) with the big Mann filter (W950/4) and change it every...

Can MTL-R (14.7) and MTL-P (11.5) be mixed to achive a fluid in the mid 13's? The OEM VW fluid is a little thick in the snow so I would like to just run MTL-P but I'm a little concerned about next summer.

Update: After 5K miles we dropped the ACD/LC mix and the oil looked like it came out of a diesel, jet black. Based on that I talked my friend into an Rx cycle. In went 15/40 HDMO (Rotella) and Rx. Currently this has about 500 miles on it. I'm wondering should we do the auto trans and PS with Rx...

Too many variables. A change from dino to synthetic, change in viscosity, change of oil pan… The silicon could be from the new pan seal, the iron could be from the new pan or you may be ingesting dirt through the K&N (I noticed a marked increase in silicone moving to Florida with all of the fine...

Thanks.

Car in question is an 02 VW TDI which only recomends full synthetic oil and I have heard too many horror stories to want to use dino. So, can I Rx with full synthetic for all phases?

What I find interesting is that if you compare M1 5W/40 and Amsoil 15W/40 the viscosities are nearly identical at 40 & 100C. Amsoil says it's 15W, Mobil says it's 5W

If you have ruled out any serious mechanical issues I would definately try the Synpower oil treatment (I get it at Autozone) with the existing oil if you don't want to change right away. It will increase viscosity and add some extra FM's. If your willing to change I agree with TS, go for the M1...

Let's see. US population is about 300M (all these numbers are WAG's by the way, anyone with real numbers please chime in), about 2/3rds between 18 and 60, about 1/2 male/female and I'll propose 25% DIY oil changers (predominately male). That equates to about 25-30 million oil DIY changers out...

Well I finally dropped the oil and it was much thicker than 30W and brown. In went ~6qts of ACD and 6oz LC. My friend reports smoother running and about 2 MPG gain. I'm still trying to talk him into an Rx cycle. My question is if he agrees can I use the oil that we just put in or should I wait...