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Elite Engineering · 04-24-2017, 08:46 PM

To add some actual info from studies, you do NOT want to ever use a solvent based engine running upper induction cleaner on ANY DI engine due to the damage the hard crystalline deposits cause when some of the coking build up material is loosened. These engines are introducing fuel at 2,000 plus PSI and unlike past port injection engines or carbureted engines where you CAN use these products safely and benefit, we have yet to see a case where there was not scouring of the pistons and cylinder walls when used on the hard sand like abrasive make up of a GDI engines deposits are broken loose as there is always some pushed between the pistons and cylinder walls. These products are seeing their core business in jeopardy with GDI engines so are pushing more and more, but Ford will void the warranty if used on an Ecoboost GDI engine. The only safe way to use these is during a manual valve cleaning allowing it to soak into the deposits to help loosen before cleaning.

The "soft carbon" of port injection engines could safely be removed with these products, but the deposits on the backsides of the intake valves on a DI engine are a hard sand like abrasive material as they are baked at such high temps with no fuel cooling the valves like in the past. Just Google search how many GDI engines had rod bearing failures shortly after a treatment, etc.

So word of warning. Want to see pictures? Have plenty of engines we have inspected if anyone wants more details.

OEMtech has some good advice. ONLY use a full synthetic oil and contrary to the new Dexos full syn, many dealers are STILL using the cheap blend for the "free" oil changes. The biggest threat to your oil is the fuel dilution with DI engines. It is not uncommon to see fuel percentages exceed the 5% fuel level where oil is considered condemned and no longer able to protect in as little as 5k miles, so for best protection, take oil samples and have tested at different mile accumulation to see.

When you look at some DI engines they can in the winter months with cold start enrichment see levels as high as 7-12% by 5-6k miles. The reasons? much higher CR DI engines run as well as unlike 45-55 PSI of port injection at 2,000 plus PSI much more fuel is washed down past the rings causing the dilution levels were seeing.

04-24-2017, 08:46 PM	#22
Elite Engineering Drives: 2010 Camaro Join Date: Nov 2009 Location: Denver Posts: 1,383	To add some actual info from studies, you do NOT want to ever use a solvent based engine running upper induction cleaner on ANY DI engine due to the damage the hard crystalline deposits cause when some of the coking build up material is loosened. These engines are introducing fuel at 2,000 plus PSI and unlike past port injection engines or carbureted engines where you CAN use these products safely and benefit, we have yet to see a case where there was not scouring of the pistons and cylinder walls when used on the hard sand like abrasive make up of a GDI engines deposits are broken loose as there is always some pushed between the pistons and cylinder walls. These products are seeing their core business in jeopardy with GDI engines so are pushing more and more, but Ford will void the warranty if used on an Ecoboost GDI engine. The only safe way to use these is during a manual valve cleaning allowing it to soak into the deposits to help loosen before cleaning. The "soft carbon" of port injection engines could safely be removed with these products, but the deposits on the backsides of the intake valves on a DI engine are a hard sand like abrasive material as they are baked at such high temps with no fuel cooling the valves like in the past. Just Google search how many GDI engines had rod bearing failures shortly after a treatment, etc. So word of warning. Want to see pictures? Have plenty of engines we have inspected if anyone wants more details. OEMtech has some good advice. ONLY use a full synthetic oil and contrary to the new Dexos full syn, many dealers are STILL using the cheap blend for the "free" oil changes. The biggest threat to your oil is the fuel dilution with DI engines. It is not uncommon to see fuel percentages exceed the 5% fuel level where oil is considered condemned and no longer able to protect in as little as 5k miles, so for best protection, take oil samples and have tested at different mile accumulation to see. When you look at some DI engines they can in the winter months with cold start enrichment see levels as high as 7-12% by 5-6k miles. The reasons? much higher CR DI engines run as well as unlike 45-55 PSI of port injection at 2,000 plus PSI much more fuel is washed down past the rings causing the dilution levels were seeing.