Technical Paper
Understanding Polyisobutylene Succinimides (PIBSI) and Internal Diesel Injector Deposits
2013-10-14
2013-01-2682
Deposit control additives have been added to diesel fuel for over 30 years to prevent the build-up of deposits in the fuel injection system and thereby ensure optimum engine operation. As the complexity of modern diesel fuel injection systems has increased their tolerance to deposit formation has decreased and therefore there is now an even greater need for high quality deposit control additives. The predominant and most effective chemistry for diesel deposit control additives used over the past 30 years is polyisobutylene succinimides (PIBSI). The design and manufacture of these additives is critical to their performance in the field in terms of functioning to control deposits but also from a no-harm standpoint. Recent work has identified low molecular weight PIBSI as a cause of internal diesel injector deposits (IDID) associated with injector sticking.