Motivx Tools Engine Oil Funnel for Most GM Vehicles

The "no funnel" approach - We've all probably been guilty of this. This is thinking you can pour a full quart of engine oil into the engine through the small hole in the valve cover from some distance above it. This is easier on some engines than others, but usually results in at least some spilled oil.

The "regular funnel" approach - Unless you can find a funnel that will friction fit into the oil fill port, they are usually too long and end up touching a baffle or something else causing restricted oil flow. Since they don't seal, if you pour oil in faster than it can drain down into the engine oil might overflow. Many times these funnels require you to hold them the entire time, otherwise they tend to fall over.

The "Motivx Tools engine oil funnel" approach - Since this funnel screws into the oil fill port, it doesn't require any holding whatsoever so you are free to use both hands. It seals to the engine with a rubber gasket so even if you pour oil in faster than it can drain down into the engine it won't leak. You can also leave single quarts of oil in the funnel to completely drain while retrieving and opening the next one.

Will this funnel fit my vehicle?
GM has used this 1/2 turn style cap for a long time, however there are some vehicles, such as the new EcoTec that use a threaded cap. Double check your oil filler cap to confirm you have this 1/2 turn style rather than a cap with traditional threads.