The correct procedure involves steps that include “blowing out” and dislodged carbon through the exhaust. The dealers can and often do spray through the intake manifold, which addresses more of the valve (deposits) surface. The detergent fuel (Top Tier) reaches the interior on every burn.where the bulk of combustion takes place and the most carbon exposure is located. Of course there is an interior and exterior side to each valve. I still use top tier fuel, but it won't help the intake valves on my Santa Fe. Hyundais do not have the second set of fuel injectors. Other manufacturers have now added a second set of injectors that spray fuel on the back side of the intake valve to keep them clean. There are aftermarket ways to deal with this and some manufacturers have recently recognized this problem and have modified PCV systems to cut down on the deposits that form on the intake valve. And guess what? Turbocharged DI engines are even more prone to the problem of intake valve deposits than a non-turbo car. This of course means that neither the gasoline you use or any additives will help to keep the valve clean. On a direct injection engine fuel is injected directly into the cylinder and never comes into contact with the back side of the intake valve. This is where the fuel's additive package helps keep the backside of the intake valve clean. On these older engines the fuel charge washes over the intake valve as it enters the cylinder. In an older fuel injected engine fuel is injected into the intake track at some point before is moves past the intake valve and into the cylinder. Hyundai dealers typically add a fuel cleaner at every oil change, specifically to help address this issue, but it's a limited value step. There's a good article on this topic - Google "How to Prevent Engine Deposits". For those folks (like me) with the 2.0T or other Turbo engines.the effects are definitely important to smooth and reliable engine performance.
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Others can build up deposits in combustion chambers and may lead to intake valve sticking. Currently, many gasoline retailers provide fuels with lower-quality additive packages that can build up deposits on fuel injectors and on intake valves. Costco gas is also on the list.īecause the Direct Injection engines in many of today's vehicles will get dirty valves quicker without using Top Tier gasoline, causing more costly engine repairs sooner that later.
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Most major brands are on the Top tier gas list, as well as some discount gas stations such as Racetrac & QuickTrip (Google for the Top tier website). After doing a good deal of research on the topic, I've seen the value in using only brands that offer Top Tier gas.