The following manufacturers endorse Penn Grade 1® Racing Oils
| Koerner Racing Cams | Tucson, AZ | www.koernerracing.com |
| Cam Motion, Inc. | Baton Rouge, LA | www.cammotion.com |
| Howard Cams | Oshkosh, WI | www.howardscams.com |
| Schneider Racing Cams | San Diego, CA | www.schneidercams.com |
| Crower Cams | San Diego, CA | www.crower.com |
| Crane Cams | Daytona Beach, FL | www.cranecams.com |
| Crane Cams Recommendation Guide | ||