Bel-Ray SL-2 Semi-Synthetic 2T Engine Oil Bel-Ray SL-2 Semi-Synthetic 2T Engine Oil is a 2-stroke synthetic motorcycle oil that provides outstanding performance in 2-stroke motorcycle engines. Reduces exhaust smoke and prevents the build-up of carbon deposits to ensure longer lasting, better performing engines. Meets the JASO FD and ISO-L-EGD ratings ensuring the highest level of detergency for better performing, longer running engines. Recommended for both autolube and pre-mix applications.