Blended with anti-wear additives and anti-oxidants, SynShield. ®, SynShield. Schaeffer's Racing Oil. ® OTR Plus Full Synthetic 5W-40. ® OTR Plus 5W-40 Diesel Engine Oil is a premium advanced performance, fully synthetic, heavy-duty diesel engine oil formulated to provide maximum protection against wear, oxidation, deposit formation, soot contamination and aeration.
