It says to add it at oil change . Is it Before or after the oil change?

The short answer is use this before the oil change at about one full gas tank away from the your oil change. After you run your full tank of gas almost empty, refill it, then change your oil ASAP. The long answer is due to modern engine designs with direct injection and high compression ratio, the gas injected into the combustion chamber will blow-by the piston rings causing the gas to dilute your oil. The nice thing is that it would probably not matter if you do a lot of driving at high way speeds for more than 1 hour each week as the blow-by gas will be recirculated into your combustion chamber to get burned of. If you do a lot of short trips and surface street driving, the engine never gets to operating temperature to burn off the excess blow-by gas, in such case, make god help your engine if it's in there for 5000 miles (oil is cheap, don't do 10,000 miles) or so. Again, the chemists at Shell Gas put a lot of cleaning agents into their gasoline and using Shell gas probably will not hurt your engine. The chemists at Gumout do not put again claims on their product, so be safe rather than sorry and use before oil change. Hope that helps.

What’s the difference between the each gum out products? Like what’s the difference between the “all in one “ and the “regane”?

All in one works better than Regane. It can be seen by looking at the price difference.

my car gas tank has 11 gallons, how many liquid can put on it ?

I'd say 1/2 to the full bottle. It will just clean the carbon faster. It doesn't hurt at all to run it that concentrated.

Can any of these gumout fuel system cleaners help with the egr valve? it has a good bit of carbon buildup.

I would first check with a GOOD auto mechanic to verify what you are claiming. If as you say, that the EGR valve has a carbon build up, is it possible to remove it for cleaning? What does your mechanic recommend? I myself use the ALL-IN ONE fuel cleaner to keep my fuel injectors & fuel system clean ONCE a month though the mfgr says every 3000 miles.

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Manufacturer	Gumout
Brand	Gumout
Model	800001366
Item Weight	10.2 ounces
Product Dimensions	8.88 x 6.75 x 9.5 inches
Item model number	510016
Is Discontinued By Manufacturer	No
Manufacturer Part Number	800001366

GUMOUT Gum Out All-in-One Gasoline Additive, Fuel Additive, Engine Cleaner (1 Piece)

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