I've read in the 4thGen forum about Chevron Techron. It said to put it in bofore an oil change. Does this mean pour in the Techron, run it out with a full tank of gas, then change oil? Thanks.

 

Exactly. You should pour the bottle of Techron into your tank just before you pump gasoline.

There are reports that Techron will increase the viscosity of the motor oil in your Max (or any car). My Max's tank holds 20 gallons, so I use the 20 gallon size of Techron. After the tank is below 1/4 full, I fill it again with gas and then change the motor oil. This technique has worked well for me, and because I keep track of mileage for the oil change, I also keep track for a Techron "clean-up." I'm using Mobil 1 and changing oil every 7.5K miles (maximum interval for Nissan to keep the warranty in effect).

 

Why wouldn't you just run the tank right down before you change the oil, given there is still Techron still in it? Or is the concentration of Techron so diluted by that point that it would have limited effect on oil viscosity?

I would be inclined to run the tank down until the idiot light came on, or close to it.

 

I don't like to go that low (normally) in the tank. You certainly want to dilute any remaining Techron before you do an oil change.

 

I agree with silvermax, although i've never heard of techron changing the viscosity, it certainly could, i have however heard of it causing increased lead levels (Which could result from a lower viscosity in the main bearings) Also it can knock stuff off the injectors, intake valves, and from inside the combustion chamber into the oil, making it dirtier.

Just an interesting side note on fuel, Your fuel pump is cooled by the gas in the tank and it doesnt get cooled as well if at all in a low tank.

 

I have the viscosity increase information from a source I trust who belongs to SAE. If you do the "Techron Clean-Up" at least every 10K miles, there won't be many deposits for the cleaner to "knock off." Most of those deposits will go out the exhaust, but some will make their way into the motor oil, so this is another good reason for doing this clean up just before an oil change. Don't know anything about "increased lead levels" -- not certain where the lead would come from.

 

Lead would come from (specualting at this point but there is a techron trend that shows increase in lead) the oil becoming thinned and not protecting as well, consequently it would allow the bearings to be worn a little more than usual.

I would defiently believe the viscosity change with techron, i have a bunch of it but im now inlove with FP60

 

I didn't know they made bearings out of lead. Thought they were steel.

Also, if Techron increases an oil's viscosity, it will be thicker, not thinner. But you are correct that thick oil can also reduce protection, particularly in cold operating conditions.

 

Ok i was looking at it different

first, i know many engines bearings are lead but the VQ's may be an exception...not sure on that one.

Seccond i always heard it would decrease viscosity, it is clearly thinnner than any 30 wt oil and if it got into your oil i dont see how it could thicken it up.

I could be wrong on both of these, but either way were on the same page saying to use it before an oil change.

 

Lead is way too soft to use to make bearings. They would wear out very quickly.

I can't explain how Techron increases oil viscosity, but there are credible reports that this does happen with the higher doses used for an engine clean-up. At least we agree that this should be done just before an oil change.

 

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